CN103716895A

CN103716895A - Resource determining method and device for physical random access channel

Info

Publication number: CN103716895A
Application number: CN201210375801.7A
Authority: CN
Inventors: 弓宇宏; 孙云锋; 张峻峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-09-29
Filing date: 2012-09-29
Publication date: 2014-04-09
Anticipated expiration: 2032-09-29
Also published as: CN103716895B; WO2014048177A1

Abstract

The invention discloses a resource determining method for a physical random access channel. The method comprises the step of configuring a plurality of physical random access channel resources for each piece of user equipment (UE), and the physical random access channel resources include at least one of the following resources: time domain resource, frequency domain resource, code domain resource and space domain resource, wherein the time domain resource is emission sub-frame configuration of a physical random access channel, the frequency domain resource is emission band configuration of the physical random access channel, the code domain resource emission sequence or orthogonal mask configuration of the random access channel, and the space domain resource is space access location configuration of the random access channel. The invention further discloses a resource determining device for a physic al random access channel. The PRACH resource reusing capability in a frequency division duplex system is improved, the PRACH collision probability is reduced, and the terminal access efficiency and the system throughput are improved.

Description

Resource determination method and device for physical random access channel

Technical Field

The present invention relates to a resource determination technology for Physical Random Access Channels (PRACH), and in particular, to a resource determination method and apparatus for a Physical Random access Channel.

Background

The Physical Random Access Channel (PRACH) is used for a terminal to send a Random Access signal (Random Access Preamble) and initiate a Random Access procedure.

Fig. 1 is a schematic Time domain structure diagram of a physical random access channel, and as shown in fig. 1, a random access signal is composed of 3 parts, namely a Cyclic Prefix (CP), a Sequence (Sequence), and a Guard Time (GT, Guard Time), as shown in table 1 below, according to different applicable scenarios (such as cell radius, link budget, etc.), a physical layer of a Long Term Evolution (LTE) system supports five random access signal formats, and the different formats have different Time lengths, and in a specific use process, a higher layer signaling indicates a configuration of the random access channel used by a cell.

TABLE 1

In terms of transmission time, for formats 0-3, the starting position of PRACH signal transmission is aligned with the starting position of a terminal subframe, and the residual time in the subframe is used as a protection time (GT) to avoid interference on a subsequent uplink subframe. And for format 4, the random access signal of format 4 can be sent at the position of UpPTS when the TDD system configures an uplink pilot Time slot (UpPTS) with a length of 2 Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the random access function is implemented with a small overhead. In terms of transmission time, the transmission time of format 4 takes the position of the order of the UpPTS of the terminal as a reference point, and in order to avoid interference on a subsequent uplink subframe, PRACH format 4 sets the length T of a Guard Time (GT)_GTApproximately 7.4 us.

In the frequency domain, the PRACH occupies 6 Physical Resource Blocks (PRB) (1.08 MHz). Taking format 0 as an example, the PRACH signal is generated as shown in fig. 2, where the bandwidth occupied by the signal is 1.048.75kHz and the portion less than 1.08MHz is used as a guard band in the frequency domain. Since the generation method of the PRACH signal is prior art, details of the generation thereof are not described herein.

The LTE physical layer uses a Zadoff-Chu sequence as a sequence for generating a random access signal.

Each cell has 64 sequences available, indicated by the downlink broadcast of the cell. The cell broadcast message indicates the logical number of 1 Zadoff-Chu base sequence and configuration information of the cyclic shift step size Ncs. When acquiring all available 64 random access sequences, firstly using the cyclic shift of the base sequence to try to obtain 64 sequences; if 1 base sequence is not sufficient, then a similar operation is performed using the next base sequence with a logical sequence number in succession until 64 available sequences are obtained.

In order to enable 64 random access sequences in the same cell to have similar power efficiency, the terminal is convenient to select and convert the random access sequences, and the condition of the signal peak-to-average ratio of each Zadoff-Chu base sequence is considered in the mapping relation between the logic sequence number of the sequences and the physical sequence number of the Zadoff-Chu sequences, so that the sequences with continuous logic sequence numbers have similar peak-to-average ratio characteristics. According to such a principle, the mapping relationship between the logical sequence number and the physical sequence number is given in a list manner in the related standard. Meanwhile, all sequences are grouped according to the sequence of the logic sequence numbers in the related standard, and the grouping embodies the characteristic that the sequence can support the value of the maximum cyclic shift in a high-speed scene, namely, the base sequences in the same group have the same value.

Different cyclic shifts of the base sequence are embodied as different phase rotations at the receiving end, and the information can be used for distinguishing different random access signals, so that different random access sequences are formed. However, in a high-speed moving scene, due to the effect of the doppler shift, a significant influence is generated on the phase of the received sequence, which may cause a false detection phenomenon of the random access signal at the receiving end. In order to avoid such a problem, in the design of the cyclic shift of the random access sequence by the LTE physical layer, special consideration is given to a high-speed scenario, that is, a reserved set is defined in the standard and corresponds to an unreserved set in a normal scenario. In the restictedset case, the number of cyclic shifts Ncs that can be used for each sequence group is limited, i.e., the number of the largest cyclic shift that the sequence group can support in a high-speed scenario is used as the corresponding Ncs.

The physical resource position allocated to the uplink random access channel in the cell is indicated by a high-level signaling. In the information on the cell random access channel configuration, the PRACH format used and the location of the physical resources are indicated.

For Frequency Division Duplex (FDD) systems, at most one PRACH channel is transmitted at each time instant, i.e. there is no Frequency Division multiplexing. The time-frequency resource location of the PRACH channel in the cell may be determined by combining the time location of the PRACH channel indicated in the configuration index table shown in table 2 and information of the high-level signaling about the frequency location of the PRACH channel. Various random access channel configuration options are listed in the relevant standards. For example, using PRACH format 0 defined in the standard, configuration #3 with a period of 10ms, assuming that the frequency location is 1, the physical resource location for the PRACH channel in the cell is as shown in fig. 3.

TABLE 2

For TDD systems, in addition to supporting transmission of PRACH format 4 on UpPTS, multiple frequency-divided PRACH channels may be transmitted at the same time. Because TDD supports configurations with different uplink and downlink time ratios, and in some configurations with less uplink time, it may be necessary to support multiple PRACH channels at the same time to provide sufficient randomnessCapacity of the access channel. In FDD systems, the indication of the PRACH physical resource location includes the time location, the radio frame number and the subframe number, and the frequency location

Fig. 3 is a schematic diagram of the physical resource location of the physical random access signal, as shown in fig. 3, and correspondingly, according to the characteristics of the TDD system, determining the resource location of the PRACH with 5 parameters includes

Andwherein:

(1)f_RAin that

Indicating the frequency position of each PRACH channel which is frequency-divided in the same time;

(2)

indicating the positions of radio frames of the PRACH channel, namely all the radio frames, odd radio frames or even radio frames;

(3)

indicating the first half frame or the second half frame of the PRACH channel in a wireless frame according to the characteristics of a TDD uplink and downlink switching period;

(4)

the uplink subframe number of the PRACH channel within the 5ms half frame is indicated.

All configuration options for the PRACH channel physical resources in the TDD system are given in the relevant standards in a list.

Fig. 4 is a schematic diagram of a PRACH frequency domain position on a common uplink subframe in a TDD system, and as shown in fig. 4, in the common subframe, since a Physical Uplink Control Channel (PUCCH) Channel exists in uplink frequency bands, the PRACH Channel is adopted

And the frequency division multiplexing method of up-down interleaving in TDD. For PRACH format 4 in TDD system, since there is no PUCCH channel on UpPTS, a different mechanism is adopted: starting from the margin of the uplink frequency domain, continuously distributing, and obtaining the gain of frequency diversity by adopting a frequency hopping mode between two times of UpPTS, namely starting from the upper sideband or the lower sideband alternatively. Suppose that

Uplink and downlink time configuration #5 was used (downlink: uplink 1: 9). Fig. 5 is a schematic diagram of PRACH frequency domain positions on a special uplink subframe in a TDD system, and as shown in fig. 5, for PRACH configurations #9 and #54 (3 PRACH channels every 10 ms) in the TDD system, on a unique uplink subframe or UpPTS in a 10ms radio frame, the PRACH channels are distributed in the frequency domain.

In the LTE-a research phase, many new technologies are introduced, such as Coordinated Multi-Point (CoMP), Carrier Aggregation (CA), Soft Cell (Soft Cell), and the like. Many new communication scenarios are proposed for the new technologies, wherein users accommodated by a single Cell in a CoMP scenario 4, a Soft Cell and other scenarios are far larger than those of a traditional Cell, so that the PRACH capacity is insufficient, and the access efficiency of the users is affected.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a method and an apparatus for determining resources of a physical random access channel, which can improve the PRACH resource multiplexing capacity in a frequency division duplex system and reduce the PRACH collision probability.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a resource determination method of a physical random access channel comprises the following steps:

configuring a plurality of physical random access channel resources for each UE, the physical random access channel resources including at least one of:

time domain resources, frequency domain resources, code domain resources, and space domain resources.

Preferably, the time domain resource is a transmission subframe configuration of a physical random access channel; the frequency domain resource is the transmission frequency band configuration of a physical random access channel; the code domain resource is a transmitting sequence or orthogonal mask configuration of a random access channel; the airspace resource is configured for the space access position of the random access channel.

Preferably, the method further comprises:

in a frequency division duplex system, a plurality of frequency division multiplexed random access channel frequency domain resources are allowed to exist in a subframe of one physical random access channel.

Preferably, the UE randomly selects, or determines, through system information or a radio resource control protocol message or a media access control unit, at least one of the random access channel frequency domain resources on the physical random access channel subframe for transmitting the physical random access channel of the UE.

Preferably, the frequency-division multiplexed random access channel frequency domain resources in the subframe of the physical random access channel are multiplexed as follows:

wherein,

is on the upper lineThe number of resource blocks is,

is a first physical resource block configured to a random access channel;

is indexed for the first resource block available within a subframe of a physical random access channel configured by a higher layer,

f_RAfor random access channel frequency domain resource index within a subframe configured by system information or radio resource control protocol message or medium access control unit or randomly selected by the UE, f_RAIs an integer of 0 or more and is,

indicating a rounding down operation.

Preferably, the method further comprises:

configuring N random access channel leader sequences for each user; the configuration of the cyclic shift amount of the random access preamble sequence of each user meets the following conditions: the interval of any two cyclic shift amounts is at least equal to one; wherein N is an integer greater than 64.

Preferably, the UE randomly selects, or determines, through system information or a radio resource control protocol message or a media access control unit, a physical random access channel in the random access channel preamble sequence, where at least one of the random access channel preamble sequences is used for transmitting the UE.

Preferably, the method further comprises:

multiple orthogonal mask values are configured for each UE.

Preferably, the UE randomly selects, or determines at least one orthogonal mask value among the plurality of orthogonal mask values through system information or a radio resource control protocol message or a media access control unit, for transmitting a physical random access channel of the UE.

Preferably, the method further comprises:

on the time-frequency resource of the random access channel of the UE, mapping an orthogonal mask on each random access symbol of the time-frequency resource of the random access channel from low frequency to high frequency in a mode of firstly frequency domain and then time domain in sequence by taking every two subcarriers as a unit;

or on the time-frequency resource of the random access channel of the UE, the orthogonal masks are mapped sequentially on part of random access symbols of the time-frequency resource of the random access channel from low frequency to high frequency by taking every two subcarriers as a unit according to a mode of firstly frequency domain and then time domain, and mapped reversely on the rest random access symbols of the time-frequency resource of the random access channel from low frequency to high frequency by taking every two subcarriers as a unit.

Preferably, the method further comprises:

and configuring a plurality of airspace positions for random access for each UE, wherein the airspace positions refer to channel information reference signal configuration resources.

Preferably, the UE randomly selects, or determines a channel information reference signal configuration resource of the UE through system information or a radio resource control protocol message or a media access control unit, and performs random access according to a spatial position to which the channel information reference signal configuration resource belongs.

A resource determination apparatus of a physical random access channel, comprising:

a configuration unit, configured to configure multiple physical random access channel resources for each UE, where the physical random access channel resources include at least one of the following resources: time domain resources, frequency domain resources, code domain resources, and space domain resources.

Preferably, in the frequency division duplex system, the configuration unit is further configured to configure a subframe of one physical random access channel to allow a plurality of frequency-division multiplexed random access channel frequency domain resources to exist.

Preferably, the apparatus further comprises a first determining unit and a first initiating unit, wherein:

a first determining unit, configured to randomly select at least one of the random access channel frequency domain resources on the physical random access channel subframe for transmitting a physical random access channel of the UE, or determine, through system information or a radio resource control protocol message or a media access control unit, at least one of the random access channel frequency domain resources on the physical random access channel subframe for transmitting a physical random access channel of the UE;

a first initiating unit, configured to initiate random access on the determined random access channel frequency domain resource.

Preferably, the apparatus further comprises:

a multiplexing unit, configured to multiplex frequency-division multiplexed random access channel frequency domain resources in a subframe of a physical random access channel in the following manner:

wherein,

for the number of uplink resource blocks,

for allocation to random access channelsA first physical resource block;

indicating a rounding down operation.

Preferably, the configuring unit is further configured to configure N random access channel preamble sequences for each UE; the configuration of the cyclic shift amount of the random access preamble sequence of each UE meets the following conditions: the interval of any two cyclic shift amounts is at least equal to one; wherein N is an integer greater than 64.

Preferably, the apparatus further comprises a second determining unit and a second initiating unit, wherein:

a second determining unit, configured to randomly select at least one of the random access channel preamble sequences for transmitting a physical random access channel of the UE, or determine at least one of the random access channel preamble sequences for transmitting the physical random access channel of the UE through system information or a radio resource control protocol message or a media access control unit;

and the second initiating unit is used for initiating the random access by using the determined random access channel preamble sequence.

Preferably, the configuration unit is further configured to configure a plurality of orthogonal mask values for each UE.

Preferably, the apparatus further comprises a third determining unit and a third initiating unit, wherein:

a third determining unit, configured to randomly select at least one of the plurality of orthogonal mask values for transmitting a physical random access channel of the UE, or determine at least one of the plurality of orthogonal mask values for transmitting the physical random access channel of the UE through system information or a radio resource control protocol message or a media access control unit;

and a third initiating unit, configured to initiate random access using the determined orthogonal mask value.

Preferably, the apparatus further comprises:

a mapping unit, configured to sequentially map, on a random access channel time-frequency resource of the UE, orthogonal masks from a low frequency to a high frequency on each random access symbol of the random access channel time-frequency resource in a manner of frequency domain first and time domain second, with every two subcarriers as a unit;

Preferably, the configuring unit is further configured to configure at least one spatial domain location for performing random access for each UE, where the spatial domain location refers to a channel information reference signal configuration resource.

Preferably, the configuring unit is further configured to configure a plurality of spatial locations for performing random access for each UE, where the spatial locations refer to channel information reference signal configuration resources.

Preferably, the apparatus further comprises a fourth determining unit and a fourth initiating unit, wherein:

a fourth determining unit, configured to randomly select a channel information reference signal configuration resource of the UE, or determine the channel information reference signal configuration resource of the UE through system information or a radio resource control protocol message or a media access control unit;

a fourth initiating unit, configured to initiate random access on the determined channel information reference signal configuration resource.

In the invention, a plurality of physical random access channel resources are configured for each UE, and the physical random access channel resources comprise at least one of the following resources: time domain resources, frequency domain resources, code domain resources, and space domain resources. The time domain resource is the configuration of a transmission subframe of a physical random access channel; the frequency domain resource is the transmission frequency band configuration of the physical random access channel; the code domain resource is a transmitting sequence or orthogonal mask configuration of a random access channel; the space domain resource is configured for the space access position of the random access channel. The invention improves the PRACH resource multiplexing capacity in the frequency division duplex system and reduces the PRACH collision probability, thereby improving the terminal access efficiency and the system throughput.

Drawings

Fig. 1 is a schematic time domain structure diagram of a physical random access channel;

fig. 2 is a schematic diagram of PRACH signal generation;

FIG. 3 is a diagram illustrating physical resource locations of physical random access signals;

fig. 4 is a schematic diagram of PRACH frequency domain locations on a common uplink subframe in a TDD system;

fig. 5 is a schematic diagram of PRACH frequency domain locations on a special uplink subframe in a TDD system;

fig. 6 is a flowchart of a resource determination method of a physical random access channel according to an embodiment of the present invention;

fig. 7a and 7b are schematic views of PRACH resource components according to embodiment 10 of the present invention;

fig. 8a and 8b are schematic views of PRACH resource components according to embodiment 11 of the present invention;

fig. 9 is a schematic diagram of a frequency domain resource composition structure of a physical random channel in embodiment 13 of the present invention;

fig. 10 is a schematic structural diagram illustrating a resource determination apparatus for a physical random access channel according to a first embodiment of the present invention;

fig. 11 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a second embodiment of the present invention;

fig. 12 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a third embodiment of the present invention;

fig. 13 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a fourth embodiment of the present invention;

fig. 14 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a fifth embodiment of the present invention;

fig. 15 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a sixth embodiment of the present invention;

fig. 16 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a seventh embodiment of the present invention.

Detailed Description

The basic idea of the invention is as follows: configuring a plurality of physical random access channel resources for each UE, the physical random access channel resources including at least one of: time domain resources, frequency domain resources, code domain resources, and space domain resources. The time domain resource is the configuration of a transmission subframe of a physical random access channel; the frequency domain resource is the transmission frequency band configuration of the physical random access channel; the code domain resource is a transmitting sequence or orthogonal mask configuration of a random access channel; the space domain resource is configured for the space access position of the random access channel.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.

Fig. 6 is a flowchart of a resource determining method of a physical random access channel according to an embodiment of the present invention, and as shown in fig. 6, the resource determining method of the physical random access channel according to the present invention includes the following steps:

step 601, configuring a plurality of physical random access channel resources for each user equipment UE.

Wherein the physical random access channel resources comprise at least one of the following resources: time domain resources, frequency domain resources, code domain resources, and space domain resources.

When multiple sets of physical random access channel resources are configured for each UE, the multiple physical random access channel resources include: at least one physical random access time domain resource, at least one physical random access frequency domain resource, at least one physical random access code domain resource, at least one physical random access spatial domain resource, and any combination thereof.

In step 602, the UE randomly selects or determines at least one physical random access channel resource for transmitting its random access channel by receiving a signaling indication.

When the UE accesses the physical random access channel, the UE randomly selects, or obtains at least one random access channel frequency domain resource on a subframe of the physical random access channel through system information or a radio resource control protocol message or a media access control unit, and the random access channel frequency domain resource is used for sending the physical random access channel of the UE.

Step 603, the UE performs random channel access on the determined physical random access channel resource.

Example 1

In a frequency division duplex system, frequency division multiplexing is allowed to be carried out on PRACH on each subframe, and UE carries out random access on each random access subframe by using at most one physical random access frequency domain resource.

The base station informs the UE1 that its PRACH configuration index is 0 through a high-level signaling;

after receiving the configuration index, the UE1 queries the configuration index table, and determines the time domain position of the PRACH transmission, where the system frame number is even and the subframe number is 1, that is, the time domain position of the PRACH transmission by the UE1 is subframe 1 in a radio frame with the system frame number being even (even radio frame).

The base station informs the UE1 of the first physical resource block index available to the UE for the radio random access channel on sub-frame 1 in each even radio frame by higher layer signaling

And PRACH random access channel frequency domain resource index f_RA；

After receiving the first physical resource block index and the PRACH frequency domain resource index available for the PRACH sent by the base station, the UE1 determines the first physical resource block index of the random access channel on subframe 1 in each even radio frame in the following manner:

wherein,for the number of uplink resource blocks,

for the first physical resource block of the random access channel configured to the UE1 on subframe 1 in each even radio frame,

to representA rounding down operation.

In summary, according to the configuration of the base station, the UE1 determines the frequency from low to high on subframe 1 in each even radio frame

The first six consecutive physical resource blocks are its physical random access resources.

The UE1 transmits the PRACH signal on the determined physical random access resource.

Example 2

The base station informs the PRACH configuration index of 6 to the UE1 through a high-level signaling;

after receiving the configuration index, the UE1 queries the configuration index table, and determines the time domain position of sending the PRACH, where the system frame number is 1, 6 for each radio frame, and the subframe number is 1, 6, that is, the time domain position of sending the PRACH by the UE1 is subframe 1 and subframe 6 in each radio frame.

The base station informs the UE1 of the first physical resource block index available to the UE for the radio random access channel on subframe 1 and subframe 6 in each radio frame by higher layer signaling

And PRACH random access channel frequency domain resource index f_RA；

After receiving the first physical resource block index and the PRACH frequency domain resource index available for the PRACH sent by the base station, the UE1 determines the first physical resource block index of the random access channel on the subframe 1 and the subframe 6 in each radio frame according to the following manner:

wherein,

for the number of uplink resource blocks,for the first physical resource block of the random access channel configured to the UE1 on subframe 1 and subframe 6 in each radio,

indicating a rounding down operation.

In summary, according to the configuration of the base station, the UE1 determines the low frequency to high frequency on subframe 1 and subframe 6 in each radio frame

The first six consecutive physical resource blocks are their physical random access resources.

Example 3

The base station informs the UE1 of the availability of the wireless random access channel on subframe 1 and subframe 6 in each radio frame by higher layer signalingThe first physical resource block index is respectively

And

the base station informs the UE1 that the frequency domain resource indexes of the wireless random access channel of the UE on the sub-frame 1 and the sub-frame 6 in each wireless frame are respectively f through high-level signaling_RA，1And f_RA，2；

for subframe 1 of each radio frame, there are:

for subframe 6 of each radio frame, there are:

wherein,

for the number of uplink resource blocks,

for the first physical resource block of the random access channel configured to the UE1 on subframe 1 in each radio frame,

indicating a rounding down operation.

In summary, according to the configuration of the base station, the UE1 determines the frequency from low to high on subframe 1 in each radio frame

Six physical resource blocks in succession for the start and from low frequency to high frequency on subframe 6

The UE1 transmits the PRACH signal on the determined physical random count resource.

Example 4

The base station informs the UE1 of the first physical resource block index available for the wireless random access channel on subframe 1 and subframe 6 in each radio frame to the UE through higher layer signaling

Base stationInforming the UE1 through high layer signaling that the UE has the frequency domain resource index f of the wireless random access channel on the sub-frame 1 and the sub-frame 6 in each wireless frame_RA，1And f_RA，2；

on subframe 1 of each radio frame:

for subframe 6 of each radio frame, there are:

wherein,for the number of uplink resource blocks,

indicating a rounding down operation.

In summary, according to the configuration of the base station, the UE1 determines the sub-frames in each radio frameFrom low frequency to high frequency on frame 1

Example 5

In the frequency division duplex system, the PRACH on each subframe is allowed to carry out frequency division multiplexing, and UE carries out random access on each random access subframe by using at most one physical random access frequency domain resource.

The base station informs the PRACH configuration index of 10 to the UE1 through a high-level signaling;

after receiving the configuration index, the UE1 queries the configuration index table, and determines the time domain position of sending the PRACH, where the system frame number is 2, 5, and 8 for each radio frame, i.e. the time domain position of sending the PRACH by the UE1 is subframe 2, subframe 5, and subframe 8 in each radio frame.

The base station informs the UE1 of the first physical resource block index available to the UE for the wireless random access channel on subframe 2, subframe 5 and subframe 8 in each radio frame through higher layer signaling

And PRACH random access channel frequency domain resource index f_RA；

After receiving the first physical resource block index and the PRACH frequency domain resource index available for the PRACH sent by the base station, the UE1 determines the first physical resource block index of the random access channel in subframe 2, subframe 5, and subframe 8 of each radio frame in the following manner:

wherein,

for the number of uplink resource blocks,

for the first physical resource block of the random access channel configured to the UE1 in subframe 2, subframe 5 and subframe 8 in each radio frame,

indicating a rounding down operation.

In summary, according to the configuration of the base station, the UE1 determines subframe 2, subframe 5, and the low to high frequency on the subframe in each radio frame

Example 6

The base station informs the UE1 that the first physical resource block index available for the wireless random access channel of the UE in sub-frame 2, sub-frame 5 and sub-frame 8 in each radio frame is respectively

And

the base station informs the UE1 that the frequency domain resource index of the wireless random access channel of the UE on the sub-frame 2, the sub-frame 5 and the sub-frame 8 in each wireless frame is f respectively through high layer signaling_RA，1、f_RA，2And f_RA，3；

After receiving the first physical resource block index and the PRACH frequency domain resource index available for the PRACH sent by the base station, the UE1 determines the first physical resource block index of the random access channel on subframe 2, subframe 5, and subframe 8 in each radio frame according to the following manner:

for subframe 2 of each radio frame, there are:

for subframe 5 of each radio frame, there are:

for subframe 8 of each radio frame, there are:

wherein,

for the number of uplink resource blocks,

for the first physical resource block of the random access channel configured to the UE1 on subframe 2 in each radio frame,

for the first physical resource block of the random access channel configured to the UE1 on subframe 5 in each radio frame,the first physical resource block of the random access channel configured to the UE1 on subframe 8 in each radio frame.

In summary, according to the configuration of the base station, the UE1 determines that its physical random access resource is: from low frequency to high frequency on subframe 2 in each radio frame

From low frequency to high frequency on subframe 5 in each radio frame for the first six consecutive physical resource blocksSix physical resource blocks in succession for the start and from low frequency to high frequency on sub-frame 8 in each radio frame

The first six consecutive physical resource blocks.

Example 7

The base station informs the UE1 of the first physical resource block index available for the wireless random access channel on subframe 2, subframe 5 and subframe 8 in each radio frame as

for subframe 2 of each radio frame, there are:

for subframe 5 of each radio frame, there are:

for subframe 8 of each radio frame, there are:

wherein,

for the number of uplink resource blocks,

for the first physical resource block of the random access channel configured to the UE1 on subframe 5 in each radio frame,

for the first physical resource block of the random access channel configured to the UE1 on subframe 8 in each radio frame,

indicating a rounding down operation.

From low frequency to high frequency on subframe 5 in each radio frame for the first six consecutive physical resource blocks

Six consecutive physical resource blocks for the start and on subframe 8 in each radio frameFrom low frequency to high frequency

The first six consecutive physical resource blocks.

Example 8

The base station informs UE1 that PRACH configuration indexes are all 0 through high-level signaling, and informs UE2 that the PRACH configuration indexes are also 0;

after receiving the configuration index, UE1 and UE2 query the configuration index table and determine the time domain position of sending PRACH, where the system frame number is even and the subframe number is 1, i.e., both the time domain positions of UE1 and UE2 sending PRACH are subframe 1 in the radio frame (even radio frame) with the system frame number being even.

And PRACH random access channel frequency domain resource index

wherein,

for the number of uplink resource blocks,

indicating a rounding down operation.

The base station informs the UE2 of the first physical resource block index available to the UE for the radio random access channel on sub-frame 1 in each even radio frame by higher layer signalingAnd PRACH random access channel frequency domain resource index

Wherein

<math> <mrow> <msubsup> <mi>n</mi> <mi>PRBoffset</mi> <mrow> <mi>RA</mi> <mo>,</mo> <mn>2</mn> </mrow> </msubsup> <mo>=</mo> <msubsup> <mi>n</mi> <mi>PRBoffset</mi> <mrow> <mi>RA</mi> <mo>,</mo> <mn>1</mn> </mrow> </msubsup> <mo>,</mo> <msubsup> <mi>f</mi> <mi>RA</mi> <mn>2</mn> </msubsup> <mo>&NotEqual;</mo> <msubsup> <mi>f</mi> <mi>RA</mi> <mn>1</mn> </msubsup> <mo>;</mo> </mrow> </math>

After receiving the first physical resource block index and the PRACH frequency domain resource index available for the PRACH sent by the base station, the UE2 determines the first physical resource block index of the random access channel on subframe 1 in each even radio frame in the following manner:

wherein,for the number of uplink resource blocks,

for the first physical resource block of the random access channel configured to the UE2 on subframe 1 in each even radio frame,

indicating a rounding down operation.

To begin with six consecutive physical resource blocks as its physical random access resource, the UE2 determines the frequency at subframe 1 from low to high on each even radio

The first six physical resource blocks are their physical random access resources.

It is clear from the above analysis that the frequency domain resources of UE1 and UE2 do not overlap or cover, so UE1 and UE2 transmit PRACH signals on the respectively determined physical random access frequency domain resources simultaneously in a frequency division multiplexing manner on subframe 1 of each even radio frame under PRACH configuration 0.

Example 9

The network side configures N (N is larger than 64) random access preamble sequences for each cell.

The UE in each cell acquires the logical index and the corresponding physical index of the cell leader ROOT SEQUENCE by acquiring system information RACH _ ROOT _ SEQUENCE; the cyclic shift amount of the own cell is acquired by acquiring 5 bits (32 kinds of cyclic shift amount settings) or more of system information or radio resource control protocol messages, wherein the configuration of the cyclic shift amount satisfies a cyclic shift interval of at least 1.

When the random access process is based on a competition mode, the UE randomly selects one leader sequence from all random access leader sequences of the cell as a leader sequence of a physical random access channel transmitted by the UE; and the base station side detects the random access leader sequence of the UE in a blind detection mode.

When the random access process is based on a non-contention mode, the UE acquires a random access preamble sequence configured to the UE by the base station through system information of the local cell, or radio resource control protocol message (RRC message), or media access control unit (MAC CE). In this way, the base station does not need to perform blind detection on the random access preamble sequence of the UE.

Example 10

The eNB configures an Orthogonal Code (OCC) for each UE. The OCC code has two values: OCC [ +1, +1] and OCC [ +1, -1 ].

Fig. 7a and 7b are schematic views of PRACH resource composition structures according to embodiment 10 of the present invention, and as shown in fig. 7a and 7b, OCC codes are sequentially mapped in units of every two PRACH subcarriers based on PRACH subcarriers from low frequency to high frequency in a frequency domain where the PRACH is located. Specifically, the mapping mode of the OCC code is as follows: on the time-frequency resource of the random access channel of the UE, sequentially mapping orthogonal masks from low frequency to high frequency on each random access symbol of the time-frequency resource of the random access channel by taking every two subcarriers as a unit according to a mode of firstly mapping a frequency domain and then mapping a time domain.

Under a non-competitive mode, a base station informs the value of an OCC code of the UE through a specific MAC layer signaling of the UE; and the UE decodes the PRACH information according to the OCC code indicated by the received signaling.

In the contention mode, the UE randomly selects one of [ +1, +1] and [ +1, -1] as its OCC code; when decoding the PRACH information, the base station performs blind detection on the OCC code between +1, +1 and +1, -1 until detecting the PRACH information of itself.

In specific use, the length of the OCC is not limited to 2, but may be equal to 4 or 8, for example, when the OCC is equal to 4, the corresponding OCC value is [ +1, +1, +1, +1] or [ +1, -1, +1, -1] or [ +1, -1, -1+1] or [ -1, +1, -1, +1 ].

Example 11

The frequency domain is mapped in a unit sequence and a reverse sequence based on PRACH subcarriers from low frequency to high frequency, specifically, the mapping mode of OCC codes is as follows: on the time-frequency resource of the random access channel of the UE, sequentially mapping orthogonal masks from low frequency to high frequency on part of random access symbols of the time-frequency resource of the random access channel in a manner of firstly mapping the frequency domain and then mapping the orthogonal masks from the low frequency to the high frequency in a unit of every two subcarriers, and inversely mapping the orthogonal masks from the low frequency to the high frequency on the rest random access symbols of the time-frequency resource of the random access channel in a unit of every two subcarriers. Fig. 8a and 8b are schematic diagrams of PRACH resource composition structures according to embodiment 10 of the present invention, and as shown in fig. 8a and 8b, the OCC is sequentially mapped from low frequency to high frequency on 1 st, 3, 5, 7, 9, and 11 th uplink symbols of each physical resource block, and is inversely mapped from low frequency to high frequency on 2 nd, 4 th, 6 th, 8, 10, and 12 th uplink symbols.

In specific use, the length of the OCC is not limited to 2, but may be equal to 4, for example, when the OCC is equal to 4, the corresponding OCC value is [ +1, +1, +1, +1] or [ +1, -1, -1+1] or [ -1, +1, -1, +1 ].

Example 12

The network side configures at least one spatial domain resource for each UE, wherein the spatial domain resources are preferably distinguished by channel information reference signal configuration resources. That is, the network side configures at least one channel information reference signal configuration resource for each UE.

And the network side broadcasts a plurality of sets of channel information reference signal (CSIRS) configuration information for each cell through the system information.

When the random access process is based on a competition mode, the UE randomly selects one set of channel information reference signals from the plurality of sets of channel information reference signals of the cell, and performs measurement and/or transmission and reception of a physical random access channel according to the channel information reference signals; and the base station side detects the physical random access channel of the UE in a blind detection mode.

When the random access process is based on a non-contention mode, the UE acquires a channel information reference signal configured to the UE by the base station through system information of the local cell, or a radio resource control protocol message (RRC message) or a media access control unit (MAC CE). In this way, the base station does not need to perform blind detection on the channel information reference signal resource of the UE.

Example 13

Fig. 8 is a schematic diagram of a structure of frequency domain resources of a physical random channel in embodiment 13 of the present invention, and as shown in fig. 8, a network side configures N (N is an integer greater than or equal to 2) frequency domain resources of the physical random channel for each UE. The base station side configures two frequency domain resources of PRACH _ f1 and PRACH _ f2 for UE1, and configures two frequency domain resources of PRACH _ f3 and PRACH _ f4 for UE2, and so on. The following description takes UE1 as an example:

when the random access process is based on a contention mode and the random channel is accessed, the UE1 randomly selects at least one physical random channel frequency domain resource from the PRACH _ f1 and the PRACH _ f2 for sending the physical random access channel of the UE; and the base station side detects the physical random access channel of the UE in a blind detection mode between frequency domain resources PRACH _ f1 and PRACH _ f2 until the PRACH information of the base station side is detected.

When the random access process is based on a non-competitive mode and a random channel is accessed, the UE acquires the physical random access channel frequency domain resource PRACH _ f1 or PRACH _ f2 configured to the UE by the base station through the system information of the cell, or radio resource control protocol message (RRC message) or media access control unit (MACCE); and the base station side detects and receives the physical random access channel of the base station side on the frequency domain resource indicated by the information through the received frequency domain resource information. In this way, the base station does not need to perform blind detection on the frequency domain resource of the physical random access channel of the UE.

The method is suitable for both frequency division duplex system and time division duplex system.

Example 14

And the network side configures a plurality of physical random channel time domain resources for each UE.

When the random access process is based on a competition mode and the random channel is accessed, the UE randomly selects at least one physical random channel time domain resource from the random channel time domain resource for sending the physical random access channel of the UE; and the base station side detects the random access subframe on which the UE sends the physical random access channel in a blind detection mode.

When the random access process is based on a non-contention mode and the random channel is accessed, the UE acquires the time domain resource of the physical random access channel configured to the UE by the base station through the system information of the local cell, the radio resource control protocol message (RRC message) or the media access control unit (MACCE). In this way, the base station does not need to perform blind detection on the physical random access channel time domain resource of the UE.

Example 15

The network side configures a plurality of sets of physical random access channel resources for each UE, wherein the physical random access channel resources comprise at least one physical random access channel time domain resource, at least one physical random access channel frequency domain resource, at least one physical random access preamble sequence resource, at least one physical random access channel information reference signal configuration resource and the like and any combination thereof.

When the random access process is an access competition mode and the random channel is accessed, the UE randomly selects at least one set of physical random access channel resources from the random access process to send the physical random access channel of the UE; and the base station side detects the physical random access channel of the UE in a blind detection mode.

When the random access process is based on a non-contention mode and the random channel is accessed, the UE acquires the physical random access channel resource information configured to the UE by the base station through the system information of the local cell, the radio resource control protocol message (RRC message) or the media access control unit (MACCE). In this way, the base station does not need to perform blind detection on the preamble sequence of the physical random access channel of the UE.

The physical random access channel resource may be an existing physical random access channel resource, or a physical random access channel resource obtained by performing capacity expansion on an existing resource.

Fig. 10 is a schematic structural diagram of a resource determination apparatus for a physical random access channel according to a first embodiment of the present invention, and as shown in fig. 10, the resource determination apparatus for a physical random access channel of this example includes:

a configuring unit 90, configured to configure a plurality of physical random access channel resources for each UE, where the physical random access channel resources include at least one of the following resources: time domain resources, frequency domain resources, code domain resources, and space domain resources.

The time domain resource is the transmission subframe configuration of a physical random access channel; the frequency domain resource is the transmission frequency band configuration of a physical random access channel; the code domain resource is a transmitting sequence or orthogonal mask configuration of a random access channel; the airspace resource is configured for the space access position of the random access channel.

In the frequency division duplex system, the configuring unit 90 is further configured to configure a subframe of one physical random access channel, where multiple frequency-division-multiplexed random access channel frequency domain resources are allowed to exist.

Fig. 11 is a schematic structural diagram of a resource determining apparatus of a physical random access channel according to a second embodiment of the present invention, and as shown in fig. 11, on the basis of the resource determining apparatus of the physical random access channel shown in fig. 10, the resource determining apparatus of the physical random access channel of this example further includes a first determining unit 91 and a first initiating unit 92, where:

a first determining unit 91, configured to randomly select at least one of the random access channel frequency domain resources on the physical random access channel subframe for transmitting a physical random access channel of the UE, or determine, through system information or a radio resource control protocol message or a media access control unit, at least one of the random access channel frequency domain resources on the physical random access channel subframe for transmitting a physical random access channel of the UE;

a first initiating unit 92, configured to initiate random access on the determined random access channel frequency domain resource.

Fig. 12 is a schematic structural diagram of a resource determining apparatus of a physical random access channel according to a third embodiment of the present invention, and as shown in fig. 12, on the basis of the resource determining apparatus of the physical random access channel shown in fig. 10, the resource determining apparatus of the physical random access channel of this example further includes:

a multiplexing unit 93, configured to multiplex frequency-division multiplexed random access channel frequency domain resources in a subframe of a physical random access channel in the following manner:

wherein,

for the number of uplink resource blocks,

is a first physical resource block configured to a random access channel;

indicating a rounding down operation.

The configuring unit 90 is further configured to configure N random access channel preamble sequences for each UE; the configuration of the cyclic shift amount of the random access preamble sequence of each UE meets the following conditions: the interval of any two cyclic shift amounts is at least equal to one; wherein N is an integer greater than 64.

Fig. 13 is a schematic structural diagram of a resource determining apparatus of a physical random access channel according to a fourth embodiment of the present invention, and as shown in fig. 13, on the basis of the resource determining apparatus of the physical random access channel shown in fig. 10, the resource determining apparatus of the physical random access channel of this example further includes a second determining unit 94 and a second initiating unit 95, where:

a second determining unit 94, configured to randomly select at least one of the random access channel preamble sequences for transmitting a physical random access channel of the UE, or determine at least one of the random access channel preamble sequences for transmitting a physical random access channel of the UE through system information or a radio resource control protocol message or a media access control unit;

a second initiating unit 95, configured to initiate random access using the determined random access channel preamble sequence.

The configuration unit 90 is further configured to configure a plurality of orthogonal mask values for each UE.

Fig. 14 is a schematic structural diagram of a resource determining apparatus of a physical random access channel according to a fifth embodiment of the present invention, and as shown in fig. 14, on the basis of the resource determining apparatus of the physical random access channel shown in fig. 10, the resource determining apparatus of the physical random access channel of this example further includes a third determining unit 96 and a third initiating unit 97, where:

a third determining unit 96, configured to randomly select at least one of the plurality of orthogonal mask values for transmitting a physical random access channel of the UE, or determine at least one of the plurality of orthogonal mask values for transmitting the physical random access channel of the UE through system information or a radio resource control protocol message or a media access control unit;

a third initiating unit 97, configured to initiate random access using the determined orthogonal mask value.

Fig. 15 is a schematic structural diagram of a resource determining apparatus of a physical random access channel according to a sixth embodiment of the present invention, and as shown in fig. 15, on the basis of the resource determining apparatus of the physical random access channel shown in fig. 10, the resource determining apparatus of the physical random access channel of this example further includes:

a mapping unit 98, configured to sequentially map, on the time-frequency resource of the random access channel of the UE, orthogonal masks from a low frequency to a high frequency on each random access symbol of the time-frequency resource of the random access channel in a manner of frequency domain first and time domain second, with every two subcarriers as a unit;

The configuration unit 90 is further configured to configure at least one spatial domain location for performing random access for each UE, where the spatial domain location refers to a channel information reference signal configuration resource.

The configuration unit 90 is further configured to configure a plurality of spatial domain positions for performing random access for each UE, where the spatial domain positions refer to channel information reference signal configuration resources.

Fig. 16 is a schematic structural diagram of a resource determining apparatus of a physical random access channel according to a seventh embodiment of the present invention, and as shown in fig. 16, on the basis of the resource determining apparatus of the physical random access channel shown in fig. 10, the resource determining apparatus of the physical random access channel of this example further includes a fourth determining unit 99 and a fourth initiating unit 910, where:

a fourth determining unit 99, configured to randomly select a channel information reference signal configuration resource of the UE, or determine the channel information reference signal configuration resource of the UE through system information or a radio resource control protocol message or a media access control unit;

a fourth initiating unit 910, configured to initiate random access on the determined channel information reference signal configuration resource.

It should be understood by those skilled in the art that the remaining processing units are not necessary technical means for achieving the basic purpose of the device discovery apparatus of the present invention, except that the configuration unit 90 is necessary technical means for achieving the basic purpose of the resource determination apparatus of the physical random access channel of the present invention.

Those skilled in the art will understand that the implementation functions of each processing unit in the resource determining apparatus of the physical random access channel shown in fig. 10 can be understood by referring to the related description of the resource determining method of the physical random access channel. Those skilled in the art will understand that the functions of each processing unit in the resource determining apparatus for physical random access channel shown in fig. 10 can be implemented by a program running on a processor, and can also be implemented by specific logic circuits.

It will be apparent to those skilled in the art that the processing units or steps of the present invention described above may be implemented by a general purpose computing device, which may be centralized on a single computing device or distributed across a network of multiple computing devices, and optionally may be implemented by program code executable by the computing devices, such that they may be stored in a storage device and executed by the computing devices, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A method for resource determination of a physical random access channel, the method comprising:

configuring a plurality of physical random access channel resources for each user equipment UE, the physical random access channel resources including at least one of:

2. The method of claim 1, wherein the time domain resource is a transmission subframe configuration of a physical random access channel; the frequency domain resource is the transmission frequency band configuration of a physical random access channel; the code domain resource is a transmitting sequence or orthogonal mask configuration of a random access channel; the airspace resource is configured for the space access position of the random access channel.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

4. The method of claim 3, wherein:

the UE randomly selects or determines at least one of the random access channel frequency domain resources on the physical random access channel subframe through system information or a radio resource control protocol message or a media access control unit to be used for sending the physical random access channel of the UE.

5. The method according to claim 3, characterized in that frequency division multiplexed random access channel frequency domain resources in a subframe of a physical random access channel are multiplexed in the following way:

wherein,

for the number of uplink resource blocks,

is a first physical resource block configured to a random access channel;

f_RAfor random access channel frequency domain resource index within a subframe configured by system information or radio resource control protocol message or medium access control unit or randomly selected by the UE, f_RAIs an integer of 0 or more and is,indicating a rounding down operation.

6. The method according to claim 1 or 2, characterized in that the method further comprises:

7. The method of claim 7, wherein:

the UE randomly selects, or determines, through system information or a radio resource control protocol message or a media access control unit, at least one physical random access channel in the random access channel preamble sequence for transmitting the UE.

8. The method according to claim 1 or 2, characterized in that the method further comprises:

multiple orthogonal mask values are configured for each UE.

9. The method of claim 8, wherein:

the UE randomly selects, or determines at least one orthogonal mask value from the plurality of orthogonal mask values through system information or a radio resource control protocol message or a media access control unit, wherein the at least one orthogonal mask value is used for sending a physical random access channel of the UE.

10. The method according to claim 8 or 9, characterized in that the method further comprises:

11. The method according to claim 1 or 2, characterized in that the method further comprises:

12. The method of claim 11, wherein:

the UE randomly selects or determines the channel information reference signal configuration resource of the UE through system information or wireless resource control protocol message or a media access control unit, and randomly accesses according to the spatial position of the channel information reference signal configuration resource.

13. An apparatus for resource determination of a physical random access channel, the apparatus comprising:

14. The apparatus of claim 13, wherein the time domain resource is a transmission subframe configuration of a physical random access channel; the frequency domain resource is the transmission frequency band configuration of a physical random access channel; the code domain resource is a transmitting sequence or orthogonal mask configuration of a random access channel; the airspace resource is configured for the space access position of the random access channel.

15. The apparatus of claim 13 or 14, wherein:

in the frequency division duplex system, the configuration unit is further configured to configure a subframe of one physical random access channel, where multiple frequency-division-multiplexed random access channel frequency domain resources are allowed to exist.

16. The apparatus of claim 15, further comprising a first determining unit and a first initiating unit, wherein:

17. The apparatus of claim 16, further comprising:

wherein,

for the number of uplink resource blocks,

is a first physical resource block configured to a random access channel;

18. The apparatus according to claim 13 or 14, wherein the configuring unit is further configured to configure N random access channel preamble sequences for each UE; the configuration of the cyclic shift amount of the random access preamble sequence of each UE meets the following conditions: the interval of any two cyclic shift amounts is at least equal to one; wherein N is an integer greater than 64.

19. The apparatus of claim 18, further comprising a second determining unit and a second initiating unit, wherein:

20. The apparatus of claim 13 or 14, wherein:

the configuration unit is further configured to configure a plurality of orthogonal mask values for each UE.

21. The apparatus of claim 20, further comprising a third determining unit and a third initiating unit, wherein:

22. The apparatus of claim 20, further comprising:

or, on the time-frequency resource of the random access channel of the UE, the orthogonal masks are sequentially mapped on part of the random access symbols of the time-frequency resource of the random access channel from low frequency to high frequency by using every two subcarriers as a unit according to a manner of first frequency domain and then time domain, and are reversely mapped on the remaining random access symbols of the time-frequency resource of the random access channel from low frequency to high frequency by using every two subcarriers as a unit.

23. The apparatus of claim 13 or 14, wherein:

the configuration unit is further configured to configure at least one spatial domain position for performing random access for each UE, where the spatial domain position refers to a channel information reference signal configuration resource.

24. The apparatus of claim 23, further comprising a fourth determining unit and a fourth initiating unit, wherein: