CN102244927A - Method, equipment and terminal for establishing uplink synchronization in multi-cell long-term evolution system - Google Patents
Method, equipment and terminal for establishing uplink synchronization in multi-cell long-term evolution system Download PDFInfo
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Abstract
The invention discloses a method, equipment and terminal for establishing uplink synchronization in a multi-cell long-term evolution system, wherein the method can be used for reducing the control channel spending of the system, increasing the resource utilization rate, shortening the waiting time required for performing uplink and downlink data transmission between the terminal and a base station and guaranteeing the service normal operation. The method for establishing the uplink synchronization in the multi-cell long-term evolution system, provided in the embodiment of the invention comprises the following steps: the base station sends an activating/deactivating command to the terminal so as to inform the terminal to initiate a random access process on an appointed secondary cell in activated secondary cells while activating one or more secondary cells in a terminal TA (Timing Advance) group, wherein an random access command is carried in the activating/deactivating command; and, after the appointed secondary cell is activated, the terminal instantly executes the random access process of the appointed secondary cell and the base station according to the received random access command so as to establish the uplink synchronization.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method, a network device, and a terminal for establishing uplink synchronization in a multi-cell long term evolution system.
Background
The Third Generation partnership Project (3 GPP) proposes new functions such as carrier aggregation in Release 10, and can support User Equipment (UE) to perform uplink and downlink data transmission simultaneously in multiple cells, and obtain a higher peak rate through a larger bandwidth (e.g., The maximum bandwidth can reach 100 MHz).
A UE may be configured to operate in a Primary Cell (PCell) and several Secondary cells (scells) simultaneously, and each operating Cell may include one downlink component Carrier, zero or one uplink component Carrier, and such multi-Cell operation may also be referred to as Carrier Aggregation (Carrier Aggregation) or bandwidth Aggregation. The Release 10 sets an uplink timing reference cell, i.e. a primary cell, for the UE operating in the carrier aggregation mode, the UE only maintains uplink timing on the primary cell, and uplink timings of all other cells are locked to the primary cell, and these cells do not need to maintain uplink timing and can directly obtain uplink transmission timing from the timing reference cell.
However, in a Long Term Evolution (LTE) communication system of 3GPP Release 11, a concept of uplink Timing Advance (TA) grouping is introduced to cells supported by a UE, and a plurality of cells of a UE are divided into a plurality of TA groups, each TA group includes a plurality of cells, and a plurality of cells in each TA group includes a cell serving as a Timing reference cell.
If a TA group does not include a primary cell, all cells in the TA group may simultaneously have a condition without uplink synchronization, and when data transmission needs to be performed by using the cells in the TA group, a random access process needs to be initiated in one cell in the TA group to establish uplink synchronization in advance, referring to fig. 1, in the existing processing method, a base station sends an activation/deactivation command to a UE, a plurality of secondary cells in one TA group are activated, and the UE feeds back a response message to the base station after receiving the activation/deactivation command; then, the base station sends a PDCCH order to the UE, assigns a random access Preamble (Preamble) to the UE, and the UE initiates a random access procedure on a secondary cell using the random access Preamble.
The inventor finds that at least the following defects exist in the prior art in the process of implementing the invention:
in the existing mechanism, the activation of the secondary cell and the initiation of the random access need to be realized by two independent signaling respectively, so that more wireless resources need to be occupied and the resource utilization rate is lower; after the secondary cell is activated, the random access process can be initiated after the network response time and the PDCCH order issuing time are passed, so that the time delay from the activation of the secondary cell to the uplink synchronization obtaining is too long, and the UE and the base station need to wait for a longer time to transmit uplink and downlink data by using the corresponding secondary cell.
Disclosure of Invention
The embodiment of the invention provides a method, equipment and a terminal for establishing uplink synchronization in a multi-cell long-term evolution system, which can reduce the overhead of a control channel of the system, improve the resource utilization rate, shorten the waiting time for the terminal and a base station to transmit uplink and downlink data and ensure the normal operation of services.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a method for establishing uplink synchronization in a multi-cell long-term evolution system, which comprises the following steps:
a base station sends an activation/deactivation command to a terminal so as to inform the terminal to initiate a random access process on a specified secondary cell in the activated secondary cells while activating one or more secondary cells in a TA group of the terminal, wherein the activation/deactivation command carries the random access command;
and the terminal immediately executes the random access process of the appointed auxiliary cell and the base station according to the received random access command after the appointed auxiliary cell is activated, and establishes uplink synchronization.
The embodiment of the invention also provides a network device for establishing uplink synchronization in a multi-cell long-term evolution system, which comprises a command sending unit and an uplink synchronization establishing unit,
the command sending unit is configured to send an activation/deactivation command to a terminal to notify the terminal to initiate a random access procedure on a designated secondary cell in the activated secondary cells while activating one or more secondary cells in the TA group of the terminal, where the activation/deactivation command carries the random access command;
and the uplink synchronization establishing unit is used for executing a random access process with the activated designated auxiliary cell and establishing uplink synchronization.
The embodiment of the invention also provides a terminal for establishing uplink synchronization in the multi-cell long-term evolution system, which comprises a command receiving unit and an uplink synchronization establishing unit,
the command receiving unit is configured to receive an activation/deactivation command sent by a base station, and when one or more secondary cells in a TA packet are activated, initiate a random access process on a designated secondary cell in the activated secondary cells, where the activation/deactivation command carries a random access command, and the random access command is carried in an activation/deactivation MAC CE of an activation/deactivation command MAC PDU, or the random access command carries a random access command MAC CE added in the activation/deactivation command MAC PDU;
and the uplink synchronization establishing unit is used for immediately executing the random access process of the designated auxiliary cell and the base station according to the received random access command after the designated auxiliary cell is activated, and establishing uplink synchronization.
As can be seen from the above, the technical solution of the embodiment of the present invention can utilize one signaling to simultaneously implement the activation of the secondary cell and the initiation of the random access, and reduce the number of times of sending PDCCH commands in the whole uplink synchronization process, thereby reducing the overhead of the control channel of the system, reducing the wireless resources required to be occupied, and improving the resource utilization rate; and because the scheme can execute the random access process immediately after the auxiliary cell is activated, the time delay from the activation of the auxiliary cell to the acquisition of uplink synchronization is avoided, the waiting time for the terminal and the base station to transmit uplink and downlink data by using the corresponding auxiliary cell is effectively shortened, the normal operation of the service is ensured, and the user experience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a method for activating a secondary cell and acquiring uplink synchronization in the prior art;
fig. 2 is a flowchart illustrating a method for establishing uplink synchronization in a multi-cell long term evolution system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an example of an uplink timing maintenance mechanism in a TA packet mode according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of an activation/deactivation MAC CE structure of an existing secondary cell activation/deactivation command;
fig. 5 is a schematic structural diagram of an expanded activation/deactivation MACCE according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of an additional mac ce according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a network device for establishing uplink synchronization in a multi-cell long term evolution system according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a terminal for establishing uplink synchronization in a multi-cell long term evolution system according to a third embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a method for establishing uplink synchronization in a multi-cell long term evolution system, and referring to fig. 2, the method includes:
21: the method comprises the steps that a base station sends an activation/deactivation command to a terminal (such as UE) to inform the terminal to initiate a random access process on a specified secondary cell in activated secondary cells while activating one or more secondary cells (SCells) in a Timing Advance (TA) group of the terminal, wherein the activation/deactivation command carries the random access command.
The random access command carries a random access Preamble (Preamble) identifier required for performing a random access operation, so that the terminal can perform random access using the corresponding Preamble.
22: the terminal sends Hybrid automatic repeat request (HARQ) feedback to the base station.
The terminal can be ensured to receive the activation/deactivation command from the base station through the HARQ feedback.
23: and the terminal immediately executes the random access process of the appointed auxiliary cell and the base station according to the received random access command after the appointed auxiliary cell is activated, and establishes uplink synchronization.
As can be seen from the above, the technical solution of the embodiment of the present invention can utilize one signaling to simultaneously implement the activation of the secondary cell and the initiation of the random access, and reduce the number of times of sending PDCCH commands in the whole uplink synchronization process, thereby reducing the overhead of the control channel of the system, reducing the wireless resources required to be occupied, and improving the resource utilization rate; and because the scheme can execute the random access process immediately after the auxiliary cell is activated, the time delay from the activation of the auxiliary cell to the acquisition of uplink synchronization is avoided, the waiting time for the terminal and the base station to transmit uplink and downlink data by using the corresponding auxiliary cell is effectively shortened, the normal operation of the service is ensured, and the user experience is improved.
The following describes a method for establishing uplink synchronization in a multi-cell long term evolution system according to a second embodiment of the present invention.
Referring to fig. 3, an example of an uplink timing maintenance mechanism in TA packet mode is shown. Wherein, cell 1 is the main cell, and cell 2 and cell 1 form a TA group; cell 3 and cell 4 form another TA group. For the TA group including cell 1, the primary cell 1 itself maintains uplink timing, and the cell 2 directly acquires uplink timing from the cell 1. For the TA group formed by the cell 3 and the cell 4, a cell needs to be used as a timing reference cell, and for example, when the cell 3 is used as the timing reference cell, the cell 4 acquires uplink timing from the cell 3.
Since the primary cell can be usually in an activated state and maintain uplink synchronization, the embodiment of the present invention mainly describes a scenario in which an uplink synchronization is established in a TA group (e.g., a TA group consisting of cell 3 and cell 4) formed by a secondary cell. It is to be understood that the present solution can also be applied in the TA group containing the primary cell when needed.
21: the base station sends an activation/deactivation command to the terminal so as to inform the terminal to initiate a random access process on a specified secondary cell in the activated secondary cells while activating one or more secondary cells in the TA group of the terminal, wherein the activation/deactivation command carries the random access command.
The designated secondary cell is a selected cell initiating random access, that is, a timing reference cell in a TA packet, and the terminal learns the designated secondary cell by at least one of the following methods:
the base station sends signaling to the terminal in advance to inform the terminal of the identifier of the designated auxiliary cell, and in this way, the timing reference cell in the TA packet can be predetermined through high-level signaling in the network, and the random access command is simplified; or,
a Cell Identifier (CID) is carried in a random access command sent by the terminal to indicate an Identifier of the designated secondary Cell that needs to be randomly accessed. In this way, a cross-cell operation can be implemented by using the cell index, for example, a random access command is sent on the subframe of the cell 4, and a random access process is executed on the subframe of the cell 3, thereby improving the utilization rate of network resources. The CID is not necessary information in the random access command, such as when the timing reference cell in the TA group is pre-configured, the cell index may be omitted in the random access command.
Further, in addition to the cell index, the random access command set by the embodiment of the present invention further includes: a random access Preamble code word Identifier (PID) and a waiting subframe number K.
The terminal acquires the random access preamble code by using the PID, and performs a random access procedure by using the random access preamble code.
The number K of the waiting subframes indicates the number K of the subframes which need to wait between the terminal receiving the random access command and the terminal executing the random access process. If the UE receives the random access command in the subframe n, the UE executes random access when starting in the subframe n + K according to the indication of the number of the waiting subframes.
The purpose of setting the number K of the waiting subframes is to facilitate the base station to control the time for the UE to perform random access, and at this time, when the random access command and the activation/deactivation command are simultaneously transmitted to the UE, the time for frequency retuning required for activating/deactivating the secondary cell needs to be considered, and the UE needs to initiate a random access process after the time when the activation/deactivation command takes effect, that is, to ensure that the random access process is performed after the corresponding secondary cell is in an activated state, thereby ensuring the successful implementation of uplink synchronization establishment.
The scheme adopts the mode that the random access command is carried in a media access control protocol data unit (MAC PDU) of an activation/deactivation command.
Specifically, the random access command may be carried in a MAC PDU of the activation/deactivation command by using at least one of the following manners:
the first method is as follows: and expanding an activation/deactivation MAC control unit (MAC CE), and carrying a random access command in the expanded activation/deactivation MAC CE. In this way, the existing activation/deactivation MAC CE is extended to include random access commands.
Referring to fig. 4, a schematic diagram of an activation/deactivation MAC CE structure for an existing secondary cell activation/deactivation command is shown, where the activation/deactivation MAC CE is composed of a byte, and each bit except a reserved bit (R) in the byte represents an activation/deactivation state of a correspondingly identified secondary cell.
Referring to fig. 5, a schematic diagram of an extended activated/deactivated MAC CE structure provided in the embodiment of the present invention is shown. The expanded activation/deactivation MAC CE includes 3 bytes, where 1 byte carries the CID and PID, and 1 byte carries the waiting subframe number. The specific meanings of the symbols in fig. 5 are as follows:
CID: cell index, taking an integer of 1-4
PID: random access Preamble identification (Preamble ID) allocated for UE
K: number of waiting subframes
R: the bit is reserved.
The second method comprises the following steps: and newly adding a random access command MAC CE, and carrying the random access command in the added random access command MAC CE. In this way, a new MAC control element, i.e. a random access command MAC CE, is introduced.
The added random access command MAC CE comprises 2 bytes, CID and PID are carried by 1 byte, and the number of waiting subframes is carried by 1 byte. Referring to fig. 6, which is a schematic structural diagram of an additional random access command MAC CE provided in the embodiment of the present invention, specific meanings of symbols in fig. 6 are as follows:
CID: cell index, taking an integer of 1-4
PID: random access Preamble identification (Preamble ID) allocated for UE
K: number of waiting subframes
R: the bit is reserved.
Furthermore, the method and the device can adjust the value of the number of the waiting subframes according to the effective time of the activation operation of the auxiliary cell, flexibly set the specific value of the number of the waiting subframes, and ensure that the terminal executes the random access process after the activation of the auxiliary cell.
Further, since the dedicated Preamble is a scarce resource, the base station can also control different UEs to send the same Preamble in different subframes, so that the timing requirement for sending the activation/deactivation command and the random access command simultaneously can be better adapted.
22: the terminal sends Hybrid automatic repeat Request (HARQ) feedback to the base station.
The terminal can be ensured to receive the activation/deactivation command from the base station through the HARQ feedback. In some scenarios, the HARQ feedback may not be set, so as to further increase the speed of establishing uplink synchronization.
23: and the terminal immediately executes the random access process of the appointed auxiliary cell and the base station according to the received random access command after the appointed auxiliary cell is activated, and establishes uplink synchronization.
As shown in fig. 3, after the secondary cell 3 is activated, the secondary cell 3 immediately executes the random access process between the secondary cell 3 and the base station according to the received random access command, and establishes uplink synchronization. After the uplink synchronization established by the secondary cell 3 is successful, the secondary cell 4 can directly acquire the uplink synchronization from the secondary cell 3.
As can be seen from the above, the technical solution of the embodiment of the present invention can utilize one signaling to simultaneously implement the activation of the secondary cell and the initiation of the random access, and reduce the number of times of sending PDCCH commands in the whole uplink synchronization process, thereby reducing the overhead of the control channel of the system, reducing the wireless resources required to be occupied, and improving the resource utilization rate; and because the scheme can execute the random access process immediately after the auxiliary cell is activated, the time delay from the activation of the auxiliary cell to the acquisition of uplink synchronization is avoided, the waiting time for the terminal and the base station to transmit uplink and downlink data by using the corresponding auxiliary cell is effectively shortened, the normal operation of the service is ensured, and the user experience is improved.
A third embodiment of the present invention provides a network device for establishing uplink synchronization in a multi-cell long term evolution system, referring to fig. 7, the network device includes a command sending unit 71 and an uplink synchronization establishing unit 72,
the command sending unit 71 is configured to send an activation/deactivation command to the terminal to notify the terminal to initiate a random access procedure on a designated secondary cell in the activated secondary cells while activating one or more secondary cells in the TA group of the terminal, where the activation/deactivation command carries the random access command;
the uplink synchronization establishing unit 72 is configured to perform a random access procedure with the activated designated secondary cell, and establish uplink synchronization.
Further, the command sending unit 71 carries the random access command in the MAC PDU of the activation/deactivation command by using at least one of the following manners:
expanding the activation/deactivation MAC CE, and carrying a random access command in the expanded activation/deactivation MAC CE; or, a random access command MAC CE is newly added, and the random access command is carried in the added random access command MAC CE.
The third embodiment of the present invention further provides a terminal for establishing uplink synchronization in a multi-cell long term evolution system, referring to fig. 8, the terminal includes a command receiving unit 81 and an uplink synchronization establishing unit 82,
the command receiving unit 81 is configured to receive an activation/deactivation command sent by a base station, and initiate a random access process on a designated secondary cell in an activated secondary cell while acquiring that one or more secondary cells in a TA packet are activated, where the activation/deactivation command carries a random access command, and the random access command is carried in an activation/deactivation MAC CE of an activation/deactivation command MAC PDU, or the random access command carries a random access command MAC CE added in the activation/deactivation command MAC PDU;
the uplink synchronization establishing unit 82 is configured to, immediately after the designated secondary cell is activated, execute a random access process between the designated secondary cell and the base station according to the received random access command, and establish uplink synchronization.
The specific working modes of each unit and module in the embodiment of the device of the invention are referred to the relevant contents of the embodiment of the method of the invention.
As can be seen from the above, the technical solution of the embodiment of the present invention can utilize one signaling to simultaneously implement the activation of the secondary cell and the initiation of the random access, and reduce the number of times of sending PDCCH commands in the whole uplink synchronization process, thereby reducing the overhead of the control channel of the system, reducing the wireless resources required to be occupied, and improving the resource utilization rate; and because the scheme can execute the random access process immediately after the auxiliary cell is activated, the time delay from the activation of the auxiliary cell to the acquisition of uplink synchronization is avoided, the waiting time for the terminal and the base station to transmit uplink and downlink data by using the corresponding auxiliary cell is effectively shortened, the normal operation of the service is ensured, and the user experience is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for establishing uplink synchronization in a multi-cell long term evolution system is characterized in that the method comprises the following steps:
a base station sends an activation/deactivation command to a terminal to inform the terminal to initiate a random access process on a specified secondary cell in activated secondary cells while activating one or more secondary cells in a TA (timing advance) group of the terminal uplink, wherein the activation/deactivation command carries the random access command;
and the terminal immediately executes the random access process of the appointed auxiliary cell and the base station according to the received random access command after the appointed auxiliary cell is activated, and establishes uplink synchronization.
2. The method of claim 1,
and carrying the random access command in a media access control protocol data unit (MAC PDU) of the activation/deactivation command.
3. The method of claim 2, wherein the random access command is carried in a MAC PDU of an activation/deactivation command using at least one of:
expanding an activation/deactivation MAC control unit (MAC CE), and carrying a random access command in the expanded activation/deactivation MAC CE; or,
and newly adding a random access command MAC CE, and carrying the random access command in the added random access command MAC CE.
4. The method of claim 3, wherein the random access command comprises a random access preamble code word identifier (PID) and a number of waiting subframes, and wherein the number of waiting subframes indicates a number of subframes that the terminal needs to wait between receiving the random access command and performing the random access procedure.
5. The method of claim 3, wherein the terminal knows the designated secondary cell by at least one of:
the base station sends a signaling to the terminal in advance to inform the terminal of the identifier of the designated auxiliary cell;
or,
the random access command further includes a cell index CID to indicate an identification of the designated secondary cell that needs to be randomly accessed.
6. The method according to claim 4 or 5,
and adjusting the number of the waiting subframes according to the effective time of the activation operation of the secondary cell.
7. The method of claim 3,
the expanded activation/deactivation MAC CE comprises 3 bytes, wherein CID and PID are carried by 1 byte, and the number of waiting subframes is carried by 1 byte;
the added random access command MAC CE comprises 2 bytes, CID and PID are carried by 1 byte, and the number of waiting subframes is carried by 1 byte.
8. A network device for establishing uplink synchronization in a multi-cell long term evolution system is characterized in that the network device comprises a command transmitting unit and an uplink synchronization establishing unit,
the command sending unit is configured to send an activation/deactivation command to a terminal to notify the terminal to initiate a random access procedure on a designated secondary cell in the activated secondary cells while activating one or more secondary cells in the TA group of the terminal, where the activation/deactivation command carries the random access command;
and the uplink synchronization establishing unit is used for executing a random access process with the activated designated auxiliary cell and establishing uplink synchronization.
9. The network device of claim 8, wherein the command sending unit carries the random access command in a MAC PDU of an activation/deactivation command by at least one of:
expanding an activation/deactivation MAC control unit (MAC CE), and carrying a random access command in the expanded activation/deactivation MAC CE; or,
and newly adding a random access command MAC CE, and carrying the random access command in the added random access command MAC CE.
10. A terminal for establishing uplink synchronization in a multi-cell long term evolution system is characterized in that the terminal comprises a command receiving unit and an uplink synchronization establishing unit,
the command receiving unit is configured to receive an activation/deactivation command sent by a base station, and when one or more secondary cells in a TA packet are activated, initiate a random access process on a designated secondary cell in the activated secondary cells, where the activation/deactivation command carries a random access command, and the random access command is carried in an activation/deactivation MAC CE of an activation/deactivation command MAC PDU, or the random access command carries a random access command MAC CE added in the activation/deactivation command MAC PDU;
and the uplink synchronization establishing unit is used for immediately executing the random access process of the designated auxiliary cell and the base station according to the received random access command after the designated auxiliary cell is activated, and establishing uplink synchronization.
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