CN101247146B - Power control method of physical channel mapped by high speed descending sharing channel - Google Patents
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Abstract
The present invention discloses a method for controlling the power of the physical channel mapped by the high-speed descending sharing channel, and the method comprises the following steps: (a) informing the maximum emitting power of the physical channel mapped by the high-speed descending sharing channel by the wireless network controller, and the maximum emitting power is the deviation value between the emitting power which is needed when the subscriber facility correctly receives the data with the high-speed descending sharing channel at the edge of the subdistrict and the emitting power of the common pilot channel; (b) when the wireless network controller transmits the data which needs to be transmitted to the subscriber facility to the base station, carrying the emitting power level used in transmitting the data in the data frame of the high-speed descending sharing channel; and (c) when the base station transmits data to the subscriber facility, confirming the emitting power which is actually used by the physical channel according to the pre-obtained maximum emitting power, the emitting power level and the emitting power of the common pilot channel, and transmitting signaling and/or data to the subscriber terminal.
Description
Technical Field
The invention relates to a power control method of a physical channel mapped by a high-speed downlink shared channel in a strengthened connection mode common state in a mobile communication system.
Background
In order to improve the High data flow of users and the throughput of the system, the R5 standard protocol of 3GPP introduces a High-Speed packet Shared transmission Channel (HS-DSCH), the physical Channel mapped by the Channel adopts time division and code division, and the Channel adopts hybrid automatic repeat request (HARQ) and Adaptive Modulation and Coding (AMC) technologies, so that the peak rate can reach 10.8Mbps to 30 Mbps. Its ultimate goal is to increase the capacity of the system by providing access to high speed packet services and to reduce transmission delays to increase the user's requirements for quality of service (QoS).
In the current protocol, for a user equipment in a forward access state (CELL _ FACH) in a Radio Resource Control (RRC) connected mode, a secondary common control physical channel (S-CCPCH) is used for signaling and data transmission, for a user equipment in a paging state (CELL _ PCH/URA _ PCH) in the Radio Resource Control (RRC) connected mode, a secondary common control physical channel (S-CCPCH) is used for receiving a paging message, and based on that the S-CCPCH channel is a multi-user shared channel and does not have a function of closed-loop power control, a higher ratio needs to be set for power in order to ensure that a user covering an edge can correctly receive signaling and data, so that power resources occupied by the CELL _ FACH and (or) the CELL _ PCH/URA _ PCH states are reduced, and the bandwidth of the S-CCPCH has certain limitation.
The signaling delay in the CELL _ FACH, CELL _ PCH, URA _ PCH states and the delay in state transition can be reduced by increasing the use of high speed shared channels in the CELL _ FACH and/or CELL _ PCH/URA _ PCH states, increasing the effective peak rate. Therefore, the 3GPP protocol standard strengthens the forward access state (CELL _ FACH) in the Radio Resource Control (RRC) connected mode and/or the paging state (CELL _ PCH/URA _ PCH) in the Radio Resource Control (RRC) connected mode, i.e. the high speed shared channel technology can be used in the CELL _ FACH and/or CELL _ PCH/URA _ PCH states (the capability of using the high speed shared channel in the CELL-FACH and/or CELL _ PCH/URA _ PCH states is referred to as the strengthened connection mode common state), and the effective peak rate of the strengthened connection mode common state is increased by the short time interval of the high speed shared channel technology, the HARQ and AMC mechanisms. The common physical channels related to the high speed shared channel include a high speed physical downlink shared channel (HS-PDSCH) and a shared control channel (HS-SCCH) used for the high speed downlink shared channel, and in order to ensure that the high speed shared physical channel in the enhanced connection mode common state can normally work, the two physical channels need to be power controlled.
However, currently, there is no method for power control of the two physical channels for the user equipment in CELL _ FACH and/or CELL _ PCH/URA _ PCH states.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for controlling the power of a physical channel mapped by a high speed downlink shared channel, and to provide a method for controlling the power of a physical channel related to a high speed downlink shared channel in a connection-enhanced mode common state, so that a base station can transmit data to a user equipment in a connection-enhanced mode common state with proper power, and correct reception of the user equipment is ensured.
In order to solve the above technical problem, the present invention provides a power control method for a physical channel mapped by a high speed downlink shared channel, which comprises the following steps:
(a) the wireless network controller informs a base station of the maximum transmitting power of a physical channel mapped by a high-speed downlink shared channel through signaling, wherein the maximum transmitting power is the deviation value between the transmitting power required by user equipment to correctly receive data by adopting the high-speed downlink shared channel at the edge of a cell and the transmitting power of a common pilot channel;
(b) when the wireless network controller sends data to be transmitted to the user equipment to the base station, carrying a transmitting power level used when the data is transmitted in a data frame of a high-speed downlink shared channel, wherein the transmitting power level is a deviation value between transmitting power required by the current position of the user equipment for correctly receiving the data and the maximum transmitting power;
(c) when the base station sends data to the user equipment, the transmitting power actually used by the physical channel is determined according to the maximum transmitting power, the transmitting power level and the transmitting power of the common pilot channel which are obtained in advance, and the transmitting power is used for sending signaling and/or data to the user terminal.
Further, the method can also have the following characteristics: in the step (a), the signaling is a common transport channel setup request message or a common transport channel reconfiguration request message.
Further, the method can also have the following characteristics: in the step (b), the radio network controller calculates the transmission power level of the physical channel according to the measurement result of the common pilot channel reported by the user equipment, the size of the mac protocol data unit, and the maximum transmission power, where the measurement result of the common pilot channel is the signal-to-interference ratio of the common pilot channel or the received signal strength or path loss of the common pilot channel; when the signal-to-interference ratio of the common pilot channel is larger or the received signal strength of the common pilot channel is stronger, the required transmitting power level is smaller; when the path loss is larger, or when the size of the mac pdu is larger, the required transmit power level is also larger.
Further, the method can also have the following characteristics: calculating the transmit power level using path loss using the following equation:
wherein, TPL is the transmitting power level, L is the path loss reported by the user equipment, NTIs noise power, gamma is a non-orthogonal factor, i is an interference factor of a neighboring cell, load is a current cell load, Eb/NoPG is the processing gain, which is equal to the ratio W/R of bandwidth to traffic rate, where W is 3.84M,
expressing the rounding, wherein MacPduSize is the size of a related protocol data unit in a data frame, CpichPower is the transmission power of a public pilot channel, and MaxHsPower is the maximum transmission power carried in signaling;
calculating the transmit power level using the signal-to-interference ratio of the common pilot channel using the following formula:
TPL＝Min(CPICH_Ec/Nomin-CPICH_Ec/No，0)
the CPICH _ Ec/N0 is the signal-to-interference ratio of the common pilot channel, and CPICH _ Ec/N0min is the signal-to-interference ratio of the common pilot signal at the cell edge.
Further, the method can also have the following characteristics: the user equipment reports the measurement result of the common pilot channel to the wireless network controller through the cell updating request message, the wireless resource control connection request message or the measurement report message.
Further, the method can also have the following characteristics: in step (c), the actual transmission power used by the physical channel is the sum of the transmission power of the common pilot channel and the maximum transmission power and the transmission power level.
Further, the method can also have the following characteristics: the physical channels are a control channel HS-SCCH for a high-speed downlink shared channel and one or more high-speed physical downlink shared channels HS-PDSCHs.
Further, the method can also have the following characteristics: in the step (c), the transmission power of the HS-SCCH channel and the HS-PDSCH channel is determined according to the transmission power actually used by the physical channel and the power distribution ratio of the HS-SCCH and the HS-PDSCH, wherein the power distribution ratio is the product of the ratio of the spreading factors of the HS-SCCH and the HS-PDSCH and the weight.
Further, the method can also have the following characteristics: when there are multiple HS-PDSCHs, the transmission power of the HS-PDSCH channel is averagely distributed to each HS-PDSCH.
Further, the method can also have the following characteristics: in the step (c), if a plurality of data blocks are multiplexed in a medium access control protocol data unit for transmission in one transmission time interval, the transmission power of the HS-SCCH channel is the maximum value of the transmission powers of the plurality of data blocks, the transmission power of the HS-PDSCH channel is the sum of the transmission powers of the plurality of data blocks, and the sum of the transmission powers of the HS-SCCH and the HS-PDSCHs is equal to or less than the sum of the maximum transmission power and the transmission power of the common pilot channel.
In order to solve the above technical problem, the present invention further provides a method for configuring a power parameter of a physical channel mapped by a high speed downlink shared channel, comprising the following steps:
(A) a wireless network controller acquires the maximum transmitting power of a physical channel mapped by a high-speed downlink shared channel;
(B) and the wireless network controller sends the maximum transmitting power to a base station through signaling.
Further, the method can also have the following characteristics: in the step (a), the radio network controller obtaining the maximum transmission power comprises: (i) the wireless network controller calculates the transmitting power required by a user to correctly receive data through a physical channel mapped by a high-speed downlink shared channel at the edge of a cell; (ii) and the wireless network controller calculates the transmission power deviation value of the transmission power relative to the common pilot channel according to the transmission power and the transmission power of the common pilot channel, and the deviation value is used as the maximum transmission power which can be used by the physical channel related to the high-speed downlink shared channel.
Further, the method can also have the following characteristics: in the step (B), the signaling is a common transport channel setup request message or a common transport channel reconfiguration request message.
Further, the method can also have the following characteristics: after the step (B), the base station saves the maximum transmitting power after receiving the signaling, and returns a response message to the radio network controller.
Further, the method can also have the following characteristics: the physical channels are a control channel HS-SCCH for a high-speed downlink shared channel and one or more high-speed physical downlink shared channels HS-PDSCHs.
Further, the method can also have the following characteristics: the maximum transmission power of the physical channel mapped by the high-speed downlink shared channel is the sum of the maximum transmission power of the physical channel HS-PDSCH and the maximum transmission power of the HS-SCCH.
The invention provides a method for controlling the power of a physical channel related to a high-speed downlink shared channel in a strengthened connection mode public state, which ensures that a base station can use proper power to transmit data when transmitting data to user equipment in the strengthened connection mode public state, ensures the correct receiving of the user equipment and simultaneously improves the capacity of a system.
Drawings
FIG. 1 is a flow chart of the power control method of HS-PDSCH and HS-SCCH according to the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, the method for controlling the power of the physical channel related to the high speed shared channel in the enhanced connection mode common state in this embodiment includes the following steps:
step 110, the radio network controller sends a signaling to the base station, wherein the signaling carries the maximum transmitting power (MaxHsPower) which can be used by the physical channel related to the high-speed downlink shared channel, namely the sum of the maximum transmitting powers of the two physical channels HS-PDSCH and HS-SCCH;
the signaling may be a common transport channel setup request message or a common transport channel reconfiguration request message. The maximum transmitting power is a relative value, and is a deviation between transmitting power (minimum transmitting power) required by a user to correctly receive data at the edge of a cell through a high-speed downlink shared channel and transmitting power of a common pilot channel, and the transmitting power of the common pilot channel is preset by a wireless network controller.
The rnc may calculate the maximum transmission power that can be used by the physical channel associated with the high-speed downlink shared channel according to the result of the pre-measurement, for example, by using a calculation formula of the transmission power level, which will be described below with reference to the path loss as an example, where the path loss at this time is the path loss of the user at the edge of the cell, that is, the maximum path loss value.
Step 120, after receiving the signaling, the base station stores the maximum transmission power that can be used by the physical channel related to the high speed downlink shared channel, and returns a response message (such as a common transport channel establishment response or a common transport channel reconfiguration response) to the radio network controller;
step 130, the user equipment reports the measurement result of the common pilot channel to the wireless network controller through a cell update request message, a radio resource control connection request message or a measurement report message;
the measurement results for the common pilot channel are: the signal to interference ratio of the common pilot channel (Ec/N0) or the received signal strength (RSCP) or the path loss (pathloss) of the common pilot channel.
When the rnc is in the channel reconfiguration process, the above step 130 is not in sequence with the steps 110 and 120, and when the rnc is in the channel establishment process, the steps 110 and 120 are executed before the step 130.
Step 140, when the rnc needs to transmit the data of the ue to the base station, calculating the available transmit power level for HS-SCCH and HS-PDSCH transmission of the data according to the measurement report value reported by the ue, the size of the mac data unit, and the maximum transmit power, and transmitting the transmit power level to the base station in the data frame of the high speed downlink shared channel;
the transmission power level is the deviation between the minimum transmission power required by the user to correctly receive data at the current position and the maximum transmission power, in other words, the deviation between the current position of the user and the transmission power required by correctly receiving data at the edge of the cell. The closer the user equipment is to the base station, the smaller the required transmission power is, and the resulting transmission power level is negative, and when the user equipment is at the cell edge, the transmission power level is zero. The transmission power level indicates that the transmission power actually usable by the physical channel is equal to or less than the maximum transmission power. The transmission power level is used for determining the total transmission power of the HS-SCCH and one or more HS-PDSCHs.
The radio network controller may determine the transmit power level by, but is not limited to: the measurement report of the common pilot channel, such as the signal-to-interference ratio (CPICH _ Ec/N0) of the common pilot channel or the received signal strength (RSCP) or the path loss (pathloss) of the common pilot channel, and the size of the mac protocol data unit, reported by the user equipment to the rnc on the random access transport channel determine the required transmit power level for the data unit. When the signal-to-interference ratio of the common pilot channel is larger or the received signal strength of the common pilot channel is stronger, the closer the user equipment is to the base station is indicated, the smaller the required transmitting power level is at the moment; when the path loss is larger, it means that the user equipment is farther away from the base station, or when the size of the mac pdu is larger, the required transmit power level is also larger at this time.
Taking the path loss as an example, the method for calculating the transmission power level is as follows:
wherein: TPL is the transmission power level, L is the path loss reported by the user equipment, NTIs noise power, gamma is a non-orthogonal factor, i is an interference factor of a neighboring cell, load is a current cell load, Eb/NoPG is the processing gain, which is equal to the ratio W/R of bandwidth to traffic rate, where W is 3.84M, 
expressed by rounding up, MacPduSize is the size of the associated pdu in the data frame, CpichPower is the transmit power of the common pilot channel, and maxhsfower is the maximum transmit power carried in the signaling.
Taking the signal-to-interference ratio of the common pilot channel (CPICH _ Ec/N0) as an example, the method for calculating the transmission power level is as follows:
TPL＝Min(CPICH_Ec/No min-CPICH_Ec/No，0)
wherein: CPICH _ Ec/N0Min is a signal-to-interference ratio of a position common pilot signal of a cell edge, and Min () represents taking a minimum value.
The method of calculating the transmit power level based on the common pilot channel received signal strength (RSCP) is similar to the method of calculating the transmit power level based on the common pilot channel signal-to-interference ratio, and is not described herein again.
Step 150, when the base station sends data to the user equipment, the base station determines the transmission power that can be really used by the physical channels (HS-SCCH and one or more HS-PDSCHs) according to the maximum transmission power and the transmission power level and the transmission power of the common pilot channel, and the base station uses the determined transmission power to send signaling and/or data on the HS-SCCH and the HS-PDSCH respectively.
The base station determines the total transmission power distributed to the HS-SCCH and the HS-PDSCH according to the maximum transmission power pre-configured by the radio network controller, the Transmission Power Level (TPL) of a media access control service data unit and the transmission power of a common pilot channel, and the specific method comprises the following steps: and the sum of the total transmission power of the HS-SCCH and the HS-PDSCHs, TransmitPowerforHs is MaxHsPower + TPL + CpichPower, and then the power distribution proportion distributed to the HS-SCCH and the HS-PDSCHs is determined according to the data bit, the spread spectrum gain and the importance degree carried by the HS-SCCH and the HS-PDSCHs, so that the transmission power of the HS-SCCH and the HS-PDSCHs is finally determined.
The base station determines the allocation proportion of the transmission power of the HS-SCCH and the HS-PDSCH according to the proportion of the spreading factors of the HS-SCCH and the HS-PDSCH, and when a plurality of HS-PDSCHs exist, the number of physical channels of the HS-PDSCH also needs to be considered, and the following formula can be adopted:
wherein: n is the number of HS-PDSCH physical channels, if the modulation mode is QPSK
If the modulation scheme is 16QAM
Wherein, MachsPduSize is the size of a protocol data unit to be sent by MAC-HS, and 16 is the spreading factor of HS-PDSCH; the spreading factor of the HS-SCCH is 128, and alpha is an importance weight and is more than or equal to 1.
It can be seen that when there is only one HS-PDSCH and the weight is equal to 1, the power allocation ratio of the HS-SCCH to the HS-PDSCH is the ratio of the spreading factors of the HS-SCCH and the HS-PDSCH.
If a plurality of MAC-c/sh/m data blocks are multiplexed in a media access control protocol data unit to be sent in one transmission time interval of a media access control entity (MAC-HS) of a high-speed downlink shared channel, the transmitting power of the HS-SCCH is the maximum value of the plurality of data blocks, the transmitting power of the HS-PDSCH is the sum of the transmitting powers of the plurality of data blocks, and the sum of the transmitting powers of the HS-SCCH and the HS-PDSCHs cannot exceed the maximum transmitting power which can be used by a physical channel related to the high-speed downlink shared channel, namely the sum of the relative maximum transmitting power and the transmitting power of a common pilot channel.
For a MAC-HS pdu, only one HS-SCCH is needed for one transmission time interval, and the HS-PDSCH may be one or more in one transmission time interval. If there are a plurality of HS-PDSCHs, each physical channel may be equally allocated on the basis of the determined transmission power.
The invention provides a physical channel power control method related to a high-speed shared channel in a strengthened connection mode public state, so that a base station can transmit data to user equipment in the strengthened connection mode public state by using proper power, correct receiving of the user equipment is ensured, and system capacity is improved.
Claims (10)
1. A power control method of a physical channel mapped by a high-speed downlink shared channel comprises the following steps:
(a) the wireless network controller informs a base station of the maximum transmitting power of a physical channel mapped by a high-speed downlink shared channel through signaling, wherein the maximum transmitting power is the deviation value between the transmitting power required by user equipment to correctly receive data by adopting the high-speed downlink shared channel at the edge of a cell and the transmitting power of a common pilot channel;
(b) when the wireless network controller sends data to be transmitted to the user equipment to the base station, carrying a transmitting power level used when the data is transmitted in a data frame of a high-speed downlink shared channel, wherein the transmitting power level is a deviation value between transmitting power required by the current position of the user equipment for correctly receiving the data and the maximum transmitting power;
(c) when the base station sends data to the user equipment, determining the actual used transmitting power of the physical channel according to the maximum transmitting power (MaxHsPower), the Transmitting Power Level (TPL) and the transmitting power (CpichPower) of the common pilot channel which are obtained in advance, and sending signaling and/or data to the user terminal by using the transmitting power; wherein,
and the total transmission power TransmitPowerFoHs of the high-speed downlink shared control channel (HS-SCCH) and the plurality of high-speed physical downlink shared channels (HS-PDSCHs) is MaxHsPower + TPL + CpichPower.
2. The method of claim 1, wherein in step (a), the signaling is a common transport channel setup request message or a common transport channel reconfiguration request message.
3. The method of claim 1, wherein in step (b), the rnc calculates the transmit power level of the physical channel according to the measurement result of the common pilot channel reported by the ue, the mac pdu size and the maximum transmit power, wherein the measurement result of the common pilot channel is the sir of the common pilot channel or the received signal strength or path loss of the common pilot channel; when the signal-to-interference ratio of the common pilot channel is larger or the received signal strength of the common pilot channel is stronger, the required transmitting power level is smaller; when the path loss is larger, or when the size of the mac pdu is larger, the required transmit power level is also larger.
4. The method of claim 3,
calculating the transmit power level using path loss using the following equation:
wherein, TPL is the transmitting power level, L is the path loss reported by the user equipment, NTIs noise power, gamma is a non-orthogonal factor, i is an interference factor of a neighboring cell, load is a current cell load, Eb/NoPG is the processing gain, which is equal to the ratio W/R of bandwidth to traffic rate, where W is 3.84M, 
expressing the rounding, wherein MacPduSize is the size of a related protocol data unit in a data frame, CpichPower is the transmission power of a public pilot channel, and MaxHsPower is the maximum transmission power carried in signaling;
calculating the transmit power level using the signal-to-interference ratio of the common pilot channel using the following formula:
TPL＝Min(CPICH_Ec/Nomin-CPICH_Ec/No，0)
the CPICH _ Ec/No is the signal-to-interference ratio of the common pilot channel, and the CPICH _ Ec/Nomin is the signal-to-interference ratio of the common pilot signal at the cell edge.
5. The method of claim 3, wherein the UE reports its measurement result of the common pilot channel to the RNC via a cell update request message, a RRC connection request message, or a measurement report message.
6. The method of claim 1, wherein in step (c), the actual transmit power used by the physical channel is the sum of a common pilot channel transmit power and the maximum transmit power and the transmit power level.
7. The method of claim 1, wherein the physical channels are a control channel HS-SCCH for a high speed downlink shared channel and one or more high speed physical downlink shared channels HS-PDSCH.
8. The method of claim 7, wherein in the step (c), the transmission powers of the HS-SCCH channel and the HS-PDSCH channel are determined according to the transmission power actually used by the physical channel and a power allocation ratio of the HS-SCCH and the HS-PDSCH, which is a product of a ratio of spreading factors of the HS-SCCH channel and the HS-PDSCH channel and the weight divided by the number of HS-PDSCH physical channels.
9. The method of claim 8, wherein when there are multiple HS-PDSCHs, the transmit power of the HS-PDSCH channels is allocated equally to each HS-PDSCH.
10. The method of claim 1, wherein in the step (c), if a plurality of data blocks are multiplexed in one medium access control protocol data unit to be transmitted in one transmission time interval, the transmission power of the HS-SCCH channel takes a maximum value of the transmission power of the plurality of data blocks, the transmission power of the HS-PDSCH channel takes a sum of the transmission power of the plurality of data blocks, and the sum of the transmission power of the HS-SCCH and the plurality of HS-PDSCHs is equal to or less than the sum of the maximum transmission power and the transmission power of the common pilot channel.
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| CN1420696A (en) * | 2001-11-16 | 2003-05-28 | Lg电子株式会社 | Method for transmisson of HS-SCCH power control information in mobile communication system |
| CN1462124A (en) * | 2002-05-11 | 2003-12-17 | 三星电子株式会社 | Method for determining high-speed physical down share channel power offset and its signalling method |
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| CN1420696A (en) * | 2001-11-16 | 2003-05-28 | Lg电子株式会社 | Method for transmisson of HS-SCCH power control information in mobile communication system |
| CN1462124A (en) * | 2002-05-11 | 2003-12-17 | 三星电子株式会社 | Method for determining high-speed physical down share channel power offset and its signalling method |
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