CN100344178C

CN100344178C - Method for realizing multi broadcasting service

Info

Publication number: CN100344178C
Application number: CNB2004100571235A
Authority: CN
Inventors: 胡军
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-08-24
Filing date: 2004-08-24
Publication date: 2007-10-17
Anticipated expiration: 2024-08-24
Also published as: CN1741631A

Abstract

The present invention discloses a method for realizing multi broadcasting service. Identical UE IDs are distributed for all UEs in a multicast group previously by an RNC. The method comprises the following steps: before data are sent by a Node B, the initial transmitting parameter and transmission parameters of the multicast service are determined; the transmission parameters are sent to all the UEs in the multicast group by the Node B, and multicast service data are transmitted according to the determined initial transmitting parameter; the UEs in the multicast group receive the multicast service data according to the received transmission parameters; in addition, ACK/NACK messages are generated according to the received multicast service data and are uploaded to the Node B. The transmission parameters of the multicast service are adjusted by the Node B according to correct receiving response / wrong receiving response messages uploaded by the UEs. The multicast service with a high speed can be realized by applying the method. Meanwhile, radio resources are saved.

Description

A kind of method that realizes multicast service

Technical field

The present invention relates to WCDMA (WCDMA) technical field, specially refer to the method that in the WCDMA system, realizes multicast service.

Background technology

In the technical standard of 3G (Third Generation) Moblie, WCDMA, the U.S. leading CDMA (CDMA) and the Chinese TD SDMA (TD-SCDMA) leading take Europe is three large mainstream technologys.

Present WCDMA standard can provide the message transmission rate of the highest 2Mbit/s, supports packet switch and circuit switching at a high speed, and many business based on the internet can be provided. Yet, for asymmetric business of up-downgoing data such as download or Streaming Media class, need system that higher transfer rate and delay still less are provided. In order to satisfy this requirement, WCDMA has done improvement to air interface, has introduced the HSDPA technology, makes it to support the peak rate up to 10Mbit/s.

The HSDPA technology is to improve a kind of important technology of downlink capacity and data service rate in the WCDMA networking later stage, is the high speed downlink packet access shared channel that 3GPP R5 version is introduced. HSDPA has increased the MAC-hs entity newly at media Access Control (MAC) layer of base station node B side, and this entity mainly is responsible for processing mixing automatic repeat request (HARQ) operation and fast dispatch algorithm; In addition, HSDPA has also increased by two descending channels and a up channel at original physical channel.

Wherein, the HSDPA down physical channel comprises: high-speed down link is shared physical channel (HS-PDSCH) and High-Speed Shared Control Channel (HS-SCCH). The data of HS-PDSCH channel bearing HSDPA descending transmission channel, spreading factor is 16, and frame length is 2ms, and every frame comprises 3 time slots. The demodulating information of HS-SCCH channel bearing demodulation HS-PDSCH channel up-downgoing data, the spreading factor of HS-SCCH is 128, and frame length is 2ms, and every frame comprises 3 time slots. In addition, the HSDPA uplink physical channel is High-Speed Dedicated Physical Control Channel (HS-DPCCH), other up channel code division multiplexings of this channel and WCDMA system, the information of carrying are that correct reception response (ACK)/mistake of HARQ receives response (NACK) information and channel quality measurement report (CQI) two parts. The spreading factor of HS-DPCCH is 256, and modulation system is quadriphase keying (QPSK).

The modulation system of the HS-PDSCH channel of HSDPA is QPSK or 16 quadrature amplitude modulation (QAM), and chnnel coding is the Turbo coding, and the coding maximum redundancy is 1/3. Modulation system and coding redundancy can dynamically be adjusted according to channel circumstance, when channel condition is good, adopt high order modulation and low redundant channels coding, and high upper strata speed is provided, and be then opposite during bad channel conditions. Because the HSDPA channel adopts 2 milliseconds of Transmission Time Intervals (TTI), can better follow the tracks of the variation of each subscriber channel condition, in time the bid condition is used for sending data preferably constantly. In order to remedy the error of Adaptive Modulation and Coding control, introduce the HARQ agreement at bottom and retransmit; In order to take full advantage of the information of each time re-transmission, adopt incremental redundancy decoding.

User data is before the HSDPA channel, radio network controller (RNC) will be unified in a cell range for each subscriber equipment (UE) distributes a customer equipment identification (UE ID), and this UE ID is used for user data and the signaling the user of channel sign of HSDPA. The UE ID that uses at the HSDPA channel is special in realizing a class UE ID of HSDPA functional definition, and length is 16 bits.

User data is as follows in HSDPA channel process:

A, Node B are when receiving the current data that need to send, consider business to be sent in the dispatching priority, its buffer area of this data service data volume, report the wireless channel environment parameter of CQI and determined each UE of ACK/NACK information by UE, determine the comprehensive priority of this UE; And according to the comprehensive priority of determining for the transmission opportunity that this UE selects downlink data, reach down channel code collection, modulation system and transmitting power etc. parameter;

B, Node B are before sending data, first carry UE ID, down channel code collection, modulation system in the HS-SCCH channel, go back redundancy versions that transmitting HARQ process identification (PID) (HARQ Process ID), coding adopt, whether be the signaling of the transformation parameters such as new data block, MAC-hs protocol Data Unit (PDU) block size; And behind 2 time slots that send the HS-SCCH channel signaling, at the user data information of respective channel transmission through modulating of HS-PDSCH;

UE in c, the residential quarter monitors the HS-SCCH channel, if the UE ID that carries in the signaling that receives conforms to the UE ID that distributes to self, then arrive corresponding HS-PDSCH channel receiving code chip level information according to the down channel code collection that carries in the signaling and modulation system parameter, and the information that receives carried out despreading, and then obtain the Physical layer bit information;

The redundancy versions that d, this UE further adopt according to the HARQ Process ID that carries in the signaling, coding, whether be the parameters such as new data block, MAC-hs PDU data block size, decoding obtains MAC-hs PDU from the bit information of Physical layer, and generates ACK/NACK information according to the result of CRC (CRC) verification;

E, UE pass through the ACK/NACK information that CRC check obtains in the HS-DPCCH channel after beginning to receive 10.5 time slots of HS-PDSCH channel data.

Can find out that from the transmission course of above-mentioned user data on the HSDPA channel down channel code collection that HSDPA can take by adjusting modulation system, code redundancy degree and UE is realized the high speed data transfer between Node B and the UE.

Development along with mobile communication technology, in some cases, the 3GPP system need to provide Node B some users' in the cell coverage area one-way data to send, and send identical data message, such as: multimedia broadcast multi-broadcasting business (MBMS, Multimedia Broadcast and Multicast Service) etc. Yet the HSDPA agreement of 3GPP does not stipulate that special physical channel is used for realizing multicast service. And above-mentioned Node B and the structure of RNC are only suitable for the high-speed data service of point-to-point, and do not consider the demand of eating dishes without rice or wine of broadcasting or multicast service, such as: reduce the resource that wireless channel takies, carry out simultaneously the high speed data transfer Holding Problem.

At present, two kinds of methods that can realize multicast service are arranged: a kind of method is to adopt DPCH, to each user assignment DPCH separately, transmits identical data. This method implements fairly simple, is feasible when number of users is fewer. But when number of users is many in the residential quarter, will be very large for the consumption of code resource and power resource.

Also having a kind of method is to adopt down public common, and constant power emission multicast service is set, and all users are receive data on identical channel. This method is very high to the utilization rate of code resource, when number of users a lot of and certain customers to be distributed in the very poor place of channel condition be feasible. But when number of users is not many especially, and these users are distributed in channel condition good local time, then waste very much Radio Resource. And because the restriction of down public common speed still can not realize multicast service at a high speed at present.

Summary of the invention

In order to solve the problems of the technologies described above, the invention provides a kind of method at HSDPA channel realization multicast service, can not change the 3GPP agreement, the multicast service for the user provides two-forty takes full advantage of Radio Resource simultaneously.

In the method for realization multicast service of the present invention, radio network controller is the identical customer equipment identification of all user equipment allocation in the multicast group;

Said method comprising the steps of:

A, Node B determined initial transmissions parameter and the transformation parameter of this multicast service according to the comprehensive priority of this multicast group subscriber equipment before sending multicast service;

B, Node B send to multicast group subscriber equipment with determined transformation parameter, and share physical channel according to the initial transmissions parameter of determining at high-speed down link and launch cast service data;

Subscriber equipment is monitored the signaling of High-Speed Shared Control Channel transmission in c, the multicast group, receives the transformation parameter that conforms to self customer equipment identification, and shares receiving multicast traffic data on the physical channel according to transformation parameter at high-speed down link; Then, generate the correct response/mistake that receives according to the cast service data that receives and receive response message, be uploaded to Node B;

The correct reception response/mistake that d, Node B upload according to subscriber equipment receives response message and adjusts the current emission parameter of multicast service.

Wherein, step a is described to determine that the method for the comprehensive priority of this multicast group subscriber equipment is specially: according to the data volume of business to be sent in the dispatching priority of this multicast service and the Node B buffer area, determine the comprehensive priority of this multicast group subscriber equipment.

The described initial transmissions parameter of step a comprises: Initial Trans, transformat variable and the channel number that takies.

Whether above-mentioned transformation parameter comprises: the redundancy versions that the customer equipment identification of this multicast group, its down channel code collection, modulation system, the process identification (PID) of mixing automatic repeat request, coding adopt, be the transmission block size parameter of the protocol Data Unit of new data block, MAC-hs.

Before carrying out the described adjustment of steps d, Node B presets the judgement adjustment cycle;

The emission parameter of the described adjustment multicast service of steps d is carried out once in a judgement adjustment cycle, may further comprise the steps:

The correct reception response/mistake that d1, Node B upload according to subscriber equipment in the multicast group receives response message and adjusts judgement;

D2, Node B adjust the emission parameter of this multicast service according to court verdict.

Node B presets and adjudicates required parameter before adjusting judgement in the steps d 1: the target coverage rate of multicast service, target Block Error Rate, adjustment thresholding sluggishness; And set in advance the good thresholding of transmission quality and poor transmission thresholding according to above-mentioned parameter;

Described adjustment judgement may further comprise the steps:

D11, Node B determine that according to the sum M of subscriber equipment in target coverage rate and the multicast group this multicast service allows at most unlapped subscriber equipment number N;

D12, Node B all subscriber equipmenies send in the statistics multicast group in a judgement adjustment cycle correct reception response message number and mistake receive the response message number, and calculate the Block Error Rate of all subscriber equipmenies in the multicast group;

D13, Node B arrange the Block Error Rate descending order of all subscriber equipmenies in the multicast group, obtain the Block Error Rate of N subscriber equipment;

D14, Node B compare the Block Error Rate of N subscriber equipment respectively with the good thresholding of transmission quality and poor transmission thresholding, if the Block Error Rate of N subscriber equipment, is then adjudicated current transmission quality less than the good thresholding of transmission quality for better; If it is relatively poor that the Block Error Rate of N subscriber equipment, is then adjudicated current transmission quality greater than the poor transmission thresholding.

The good thresholding of above-mentioned transmission quality is that target Block Error Rate and 1/2nd is adjusted the poor of thresholding sluggishness; Described poor transmission thresholding is that target Block Error Rate and 1/2nd is adjusted the sluggish sum of thresholding.

The unlapped subscriber equipment number of steps d 11 described maximum permissions N is: 1 subtracts the long-pending integer value through obtaining after rounding up of the sum M of subscriber equipment in the difference of target coverage rate and the multicast group;

The Block Error Rate of steps d 12 described subscriber equipmenies is: the number that correctly receives response message receives the merchant that response message number sum obtains divided by the correct number that receives response message with mistake.

Described emission parameter comprises: transmitting power, transformat variable and the channel number variable that takies.

In addition, in the steps d 2, before Node B adjusts emission parameter, preset and adjust required parameter: the adjustment step-length of the maximum of multicast service transmitting power and minimum of a value, transmitting power, transformat variable are adjusted the maximum of step-length and busy channel number;

Steps d 2 described adjustment may further comprise the steps:

D21, maintenance transformat variable are 0, and the channel number that takies is maximum,

If current transmission quality is better, then the adjustment step value according to transmitting power reduces transmitting power, until the minimum of a value of transmitting power, if when transmitting power is adjusted to minimum of a value, transmission quality is still better, then execution in step d22;

If current transmission quality is relatively poor, then the adjustment step value according to transmitting power increases transmitting power, until the maximum of transmitting power, if when transmitting power is adjusted to maximum, transmission quality is still relatively poor, then execution in step d23;

D22, maintenance transmitting power are minimum of a value, and the channel number that takies is maximum,

If current transmission quality is better, then increase the value of transformat variable according to the adjustment step value of transformat, until the maximum 101 of transformat variable, if adjusted at 101 o'clock at the transformat variable, transmission quality is still better, then returns steps d 22;

If current transmission quality is relatively poor, then reduce the value of transformat variable according to the adjustment step value of transformat, until the minimum of a value of transformat variable, if adjusted at 0 o'clock at the transformat variable, transmission quality is still relatively poor, then execution in step d21;

D23, maintenance transmitting power are maximum, and the transformat variable is 0,

If current transmission quality is better, then increase the channel number value with step value 1, until the maximum of channel number, if when the channel number variable has been adjusted to maximum, transmission quality is still better, then execution in step d21;

If current transmission quality is relatively poor, then reduce the channel number value with step value 1, until the minimum of a value of channel number, if when the channel number variable has been adjusted to minimum of a value, transmission quality is still relatively poor, then returns steps d 23.

Steps d further comprises: Node B carries out Retransmission control to multicast service;

Described Retransmission control is specially: for the cast service data piece on a upper strata, transmitted after n time at Node B, Node B statistics not yet sends the correct number of user equipment that receives response message, if n is less than predefined maximum retransmit number, and not yet the ratio of subscriber equipment sum then retransmits this data block greater than predefined data re-transmission thresholding in the number of user equipment of the correct reception of transmission response message and the multicast group; Otherwise Node B does not retransmit.

This shows, use and of the present inventionly can obtain following beneficial effect:

1, method of the present invention has realized the transmission of multicast service on same HS-PDSCH channel by the method for the identical ID of all user assignments in the multicast group, has saved greatly Radio Resource.

2, method of the present invention is in the transmission course of cast service data, the MAC-hs entity of Node B is by the response message of user's receive data in the statistics multicast group, judge current transmission quality, and adjust dynamically transmitting power, the transformat of this cast service data and the channel number that takies, in the excellent situation of channel transmission quality, reduce transmitting power, can increase descending transfer rate simultaneously, realize high speed data transfer.

3, the method for adjustment of the present invention channel number that can adjust transmitting power, transformat and take, very large dynamic range is provided, guaranteed that multicast service also can transmitting in abominable wireless environment, in good wireless environment, can take full advantage of wireless bandwidth resource simultaneously.

4, retransmission mechanism of the present invention has solved the problem that multicast service retransmits in the multicast group, obtain the gain of incremental redundancy decoding, in the situation that number of users is moderate in the multicast group, further improves efficiency of transmission.

Description of drawings

Fig. 1 is the flow chart of realization multicast service method of the present invention;

518129 Longgang District Sakata Huawei headquarters building...

Specific embodiments

The object of the present invention, the technical solutions and advantages more clearly understood with reference to accompanying drawings and the following Examples of the present invention is described in further detail.

For a UE receiving multicast traffic, the need to pre-register the multicast traffic, and the Business registration information is stored in the broadcast multicast service Business Center (BM-SC, Broadcast-Multicast Service Centre) as the basis for authentication. For example, MBMS service MBMS service centers need to keep records of business information to all users.

Further, in order to implement HSDPA channel multicast service, RNC also registered under the UE Business information, to the same small area, within the same multicast group, the same uniform distribution of all UE The UE ID, to ensure the same multicast group, all the UE may receive and demodulate the registered multicast service.

As 3GPP agreement, the HSDPA UE ID channel is dedicated to the realization HSDPA Functional definition of a class of UE ID, and no other purpose, therefore, after analysis, RNC for multicast group UE is allocated within the same type of UE ID no other problems. In addition, UE ID length is 16-bit, can be assigned to more than 60,000 users, this value is much greater than the Node B can be supported Users. Therefore, RNC and Node B may agree, which will be part of the UE ID is reserved for multicast use Households, when RNC UE ID assigned to the UE agreed in this time range, Node B can be The UE to know the multicast user.

The Node B MAC-hs entity in HSDPA downlink multicast service transmitted on the channel until the required Determining in advance the transmission timing of the multicast service. In the prior art, MAC-hs entity needs to integrate Consider scheduling priority of the business, its buffer the amount of data to be transmitted businesses, individual users without Line channel environment to determine the priority of each user integrated, thereby selecting a higher priority excellent service data Sent first. For multicast service, the multicast group all users in their respective upstream HS-DPCCH channel to send the CQI information and ACK / NACK information, so, MAC-hs can not According to environmental information to select a single user wireless data transmission timing. ...

Node B determines multicast service transmission opportunity later, you can send a multicast service. Figure 1 Shows the implementation of the present invention the process of multicast service. Shown in Figure 1, the present invention achieve more Multicast service method includes the following steps: ...

Wherein the transmission parameters include: a multicast group UE ID, downlink channel code set, modulation scheme, HARQ Process ID, coding using a redundancy version, whether the new data block, MAC-hs protocol data unit Yuan (PDU) block size; ...

Step 103: The UE In further accordance with the signaling carried by HARQ Process ID, coding mining A redundancy version, whether the new data block, MAC-hs PDU block size and other parameters, from the physical layer The bit information is MAC-hs PDU, and MAC-hs PDU CRC check, according to the CRC Generated as a result verification ACK / NACK information, if the check result is correct, then generates an ACK consumption Interest; erroneous results if the checksum is generated NACK message; ...

Step 105: Node B's MAC-hs entity within the group according to the multicast in each UE HS-DPCCH channel returns the ACK / NACK information, adjusting the transmission parameter of the multicast service, and For retransmission control. ...

It should be noted that the above step 101, the HS-PDSCH channel corresponding downlink channel code set Multicast traffic is transmitted before the data, Node B's MAC-hs entity needs to first determine that multicast industry The initial service data transmission parameters, these parameters include:

The initial transmit power IntPwr, this parameter is usually Node B according to the channel conditions vary, The power distribution system allows the upper quality of service required to set the appropriate value;

Occupied downlink HS-PDSCH channel code number ChaNum, the parameter is a positive integer, value range Wai is 1-15;

Variable transmission format TbSize, the value indicates that the multicast service channel in the downlink HS-PDSCH Transmission transport format used when the parameter is a positive integer in the range 0-101.

Among them, the transmission format variable TbSize the invention defined variables one hand, it contains a Modulation scheme information, one containing the transport block size information. According to 3GPP agreement, when HS-PDSCH a certain number of channels, the use of QPSK modulation and 16QAM modulation, respectively, There are 63 kinds of transmission formats, the HS-SCCH channel through the transport block size (Transport-block size) Domain notify the user, ranging from 0-62. 24 kinds of transmission format which are overlapped, so pass A total of 102 kinds of output formats. In addition, according to the 3GPP agreement, Transport-block size of the The value indicates that data is not HSDPA downlink channel HS-PDSCH transmission the actual transport block size Small, but a range from 0 to 62 index. 3GPP protocol provides a table, according to the The Transport-block size index, and HS-PDSCH channel code number, the modulation method, found the letter Road to the actual transmission of the transport block size. Therefore, in order to facilitate adjustment, the present invention introduces variable transmission format Amount TbSize, ranging from 0 to 101, contains a total of 102 kinds of transmission formats, so you can achieve Modulation and Transport-block size of uniform adjustment. In the present invention, a preferred embodiment of the , When TbSize less than or equal to a predetermined maximum transmission QPSK modulation format of the variable MaxTbSizeIndForQPSK value, it indicates that data using QPSK modulation, time Transport-block size to take TbSize; when the TbSize than MaxTbSizeIndForQPSK when Description of the data using 16QAM modulation mode, then the transport block size variable Transport-block size Take TbSize-39. Among them, the use of QPSK modulation, the maximum value of a variable transmission format MaxTbSizeIndForQPSK as ranging from 39 to 62 integer, an operator can configure Method parameters. ...

Further, the adjustment step 105 of the transmission parameters of the multicast service method requires pre-set A judgment adjustment cycle parameter, which by the Node B MAC-hs entity's value is set based on experience The. ...

Step 201: Node B's MAC-hs entity within the group according to the multicast in each UE HS-DPCCH channel returns the ACK / NACK information judgment adjusted.

Step 201: Node B's MAC-hs entity within the group according to the multicast in each UE HS-DPCCH channel returns the ACK / NACK information judgment adjusted....

Step 2011: Node B's MAC-hs entity according to the preset CoverageTar and multi- The total number of multicast group UE M, determined that the multicast service is not covered by UE Maximum number N;

In this step, N can be calculated using the following formula and obtained after rounding up:

N＝(1-CoverageTar)×M

Wherein the target multicast service coverage CoverageTar, the parameter indicates that the multicast service Head The number of standard coverage UE, usually by the Node B MAC-hs entity under cover good UE ayes UE multicast group setting the ratio of the total number of M, as a percentage;

Wherein the target multicast service coverage CoverageTar, the parameter indicates that the multicast service Head The number of standard coverage UE, usually by the Node B MAC-hs entity under cover good UE ayes UE multicast group setting the ratio of the total number of M, as a percentage;...

Step 2013: Node B MAC-hs entity of the multicast group BLER of all the UE from the large To a small order, to obtain the N-th UE BLER, the BLER-N; ...

Step 2014: Node B MAC-hs entity of BLER-N, respectively, the transmission quality threshold (T-good), and poor transmission quality threshold (T-bad) comparison, if less than BLER-N T-good, then the verdict current transmission quality is better; if BLER-N is greater than T-bad, then the current judgment Transmission quality is poor.

Where, T-good for the target block error rate (BLERTar) and half to adjust Threshold Hysteresis (ThreHyst) difference; T-bad as BLERTar with half ThreHyst and;

BLERTar means that you can ensure that the quality of service objectives multicast block error rate, usually by the Node B The MAC-hs entity multicast service according to the quality requirements set, as a percentage;

ThreHyst used to set the adjustment threshold hysteresis area, avoid frequent adjustments, usually by the Node B The MAC-hs entity set based on experience, as a percentage.

At this point, Node B MAC-hs entity of the multicast group according to the user's block error rate to get the multicast Current transmission quality business judgment, that the higher the block error rate, transmission quality deteriorates.

Said adjustment step 202 above specifically: Node B according to the judgment result of step 201, Is divided into three phases adjusting the transmission parameter of the multicast service, the transmit power, the transmission format, and The number of channels occupied.

Said adjustment step 202 above specifically: Node B according to the judgment result of step 201, Is divided into three phases adjusting the transmission parameter of the multicast service, the transmit power, the transmission format, and The number of channels occupied....

Shown in Figure 2, Figure 2, the three solid lines represent the three phases of adjustment of the dotted line indicate that the tri The transition between stages. The solid line in Figure 2 and the dotted lines in the direction of arrow represents the elapsed after the judgment, the transmission Poor quality of the direction of adjustment. When the transmission quality is better adjustment method is shown by the arrow in Figure 2 In the opposite direction. Shown in Figure 2, Node B in a multicast service after the initial transmission, proceed to Step 2021 The adjustment of transmit power adjustment stage, said adjustment includes the following steps:

Step 2021: transmit power adjustment phase, maintaining transmission format variable TbSize 0, occupancy ChaNum number of channels is the maximum, according to the judgment result of step 201, adjust the transmit power,

If the current transmission quality is better, in accordance with transmit power adjustment step size decreases fat PwrStep Transmit power, a minimum transmit power until MinPwr, if the transmit power has been adjusted to the minimum Values, the transmission quality is still good, then step 2022 a transport format TbSize adjustment phase;

If the current transmission quality is poor, in accordance with the transmit power adjustment step value increases hair PwrStep Transmit power, the maximum transmit power until MaxPwr, if the transmit power has been adjusted to the maximum Values, the transmission quality is still poor, the process proceeds to step 2023 to adjust the number of channels ChaNum stage;

Wherein the maximum transmission power and minimum MinPwr MaxPwr said Node B in the next HS-PDSCH channel line maximum and minimum transmission power, the Node B value is set based on experience; Transmit power adjustment step size PwrStep, that the Node B MAC-hs entity of a power Adjust the granularity of the unit dB, based on experience from the Node B setting;

Wherein the maximum transmission power and minimum MinPwr MaxPwr said Node B in the next HS-PDSCH channel line maximum and minimum transmission power, the Node B value is set based on experience; Transmit power adjustment step size PwrStep, that the Node B MAC-hs entity of a power Adjust the granularity of the unit dB, based on experience from the Node B setting;...

If the current transmission quality is poor, adjusted in accordance with the transmission format decreases the step value TbSizeStep Transmission format variable TbSize's value until the minimum transmission format variable TbSize, if transmission TbSize variable transport format has been adjusted to 0, the transmission quality is still poor, the process proceeds to step 2021 The transmit power adjustment phase, adjusting transmit power;

Wherein the transmission format that the variable step size TbSizeStep the Node B MAC-hs entity A transmission format for particle size adjustment, is a positive integer, by the Node B setting based on experience.

Step 2023: the number of channels ChaNum adjustment phase, keeping to the maximum transmit power, the grid Type variable TbSize to 0, according to the judgment result of step 201, the number of channels occupied by adjusting ChaNum,

If the current transmission quality is better, step places the value 1 increasing the number of channels ChaNum values until The maximum number of channels ChaNum MaxChanNum, if the number of channels variable ChaNum Has been adjusted to the maximum value, the transmission quality is still good, then the process proceeds to step 2021 the transmit power adjustment The whole stage, adjusting transmit power;

If the current transmission quality is poor, a value of 1 places step ChaNum value decreases the number of channels, until ChaNum the minimum number of channels, if the number of channels have been adjusted to the minimum variable ChaNum Values, the transmission quality is still poor, no further adjustment, processing returns to step 2023.

As the transmission format of the multicast service data defines the modulation scheme and the actual transport block size, Therefore, by adjusting the data transmission format can be adjusted for the actual rate and the degree of redundancy, ie transmission block The smaller, the greater the redundancy, block error rate will be reduced accordingly; transport block greater redundancy is smaller, the number of The higher the data rate, thus adjusting multicast service transmission format equivalent to adjust transmit power.

In addition, the number of channels occupied by said multicast service to the downstream code channels occupied by the number of channels, as The downlink multicast service data is the total power is constant, that is, the multicast service the number of channels occupied by more More, the power of each channel is smaller, so that the multicast service to adjust the number of channels occupied, but also with When used with multiple transmit power adjusted.

In an embodiment of the present invention, Node B according to the actual rate of change and changes BLER The actual range and allowing adjustment speed, set the appropriate ThreHyst, judgment adjustment cycle, PwrStep and TbSizeStep, to simultaneously adjust the smoothness and adjust to meet the speed requirements.

The above analysis, the present invention is a method of multicast service data transmission process, Node B MAC-hs entity of the multicast group within the statistical data, the user receives the response message, determine the current pass Transmission quality, and dynamically adjusting the multicast service data transmission power of the transmission signal format and the occupied The number of channels in the channel transmission quality and a better case, reducing the transmission power, and can increase the downlink The transmission rate, high-speed data transmission. The adjustment method of the present invention can adjust the transmit power, pass Transport format and the number of occupied channels, providing a large dynamic range, to ensure that the multicast service of the wicked Poor wireless environment can be reliably transmitted, and in a good radio environment can make full use without Line bandwidth resources. ...

A preferred embodiment of the present invention, examples are given of the application of the multicast service retransmission mechanism. The embodiment The retransmission mechanism in particular: an upper layer for the multicast service data blocks, the Node B MAC-hs entity after the transfer of the n times, Node B has not properly received statistical data and sending ACK UE the number of messages and set NoAckCnt. If n is less than MaxTranNum and NoAckCnt The multicast group, the ratio of the total number of UE is greater than the threshold data retransmission BlerThd, then the data block into Line retransmission; otherwise, Node B's MAC-hs entity is no retransmission.

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According to 3GPP agreement, UE is listening HS-SCCH signaling downstream channel, if the inspection Measured data to the new fast pointer (New-data indicator) indicates that the data block is not new data blocks and And the UE has correctly received the previous data block, responded ACK message, the UE on the Second transmitted data block will not be processed. This ensures that in the retransmission mechanism, even if the weight Not affect the pass is correctly received by the user.

As can be seen from the above method, the retransmission mechanism of the present invention to solve the multicast service in the multicast group Retransmission problem in the number of users in the multicast group, the case of moderate to further improve transmission efficiency.

As can be seen from the above method, the retransmission mechanism of the present invention to solve the multicast service in the multicast group Retransmission problem in the number of users in the multicast group, the case of moderate to further improve transmission efficiency....

Claims

As can be seen from the above method, the retransmission mechanism of the present invention to solve the multicast service in the multicast group Retransmission problem in the number of users in the multicast group, the case of moderate to further improve transmission efficiency....

Said method comprising the steps of:

a, Node B before sending the multicast service, the multicast group according to the user equipment to its priority Determining the initial transmission of multicast service parameters and transmission parameters;

b, Node B determines the transmission parameters of the multicast group sent to the user equipment, and according to the determined The initial launch parameters in high-speed downlink shared physical channel transmitting multicast service data;

b, Node B determines the transmission parameters of the multicast group sent to the user equipment, and according to the determined The initial launch parameters in high-speed downlink shared physical channel transmitting multicast service data;...

b, Node B determines the transmission parameters of the multicast group sent to the user equipment, and according to the determined The initial launch parameters in high-speed downlink shared physical channel transmitting multicast service data;...
2, as claimed in claim 1, characterized in that said determining step a multicast group that the Priority user equipment integrated approach specifically: According to the multicast service scheduling priority and Node B buffer zone volume of service data to be transmitted, determining the multicast group the user equipment to its priority Level. ...
2, as claimed in claim 1, characterized in that said determining step a multicast group that the Priority user equipment integrated approach specifically: According to the multicast service scheduling priority and Node B buffer zone volume of service data to be transmitted, determining the multicast group the user equipment to its priority Level. ...
4, as claimed in claim 1, characterized in that said transmission parameters include: the User devices a multicast group identifier, the downlink channel code set, a modulation scheme, hybrid automatic retransmission request into Cheng identification, coding using a redundancy version, whether the new data block, MAC-hs protocol data unit Per transport block size parameters.
5, as claimed in claim 1, characterized in that, during said adjustment step d Before, Node B preset judgment adjustment cycle;

Said adjusting step d multicast service transmission parameters in an adjustment of executing a judgment, Comprising the steps of:

d1, Node B according to the multicast group to upload the correct user device receives the response / error response received Information to adjust the judgment;

d1, Node B according to the multicast group to upload the correct user device receives the response / error response received Information to adjust the judgment;...
6, as claimed in claim 5, characterized in that the Node B during step d1 Adjusted pre-judgment, pre-set parameters needed for decision: multicast service coverage goals, objectives Block error rate, adjust the threshold hysteresis; and in accordance with the above parameters pre-set threshold transmission quality is good and the transmission Poor quality threshold;

Said adjusting decision comprises the steps of:

d11, Node B coverage of the target multicast group and the total number of devices within the user M, to determine the more Multicast service allows a maximum number of user devices not covered by N;

d12, Node B in a judgment within the statistical adjustment period for all users within the multicast group sent by the device The response message is received correctly receive the response message number and the number of error and calculate all users in the multicast group Equipment block error rate;

d13, Node B to all users in the multicast group block error rate devices are arranged in descending order, too To the N-th block error rate of user equipment;

d14, Node B to the N-th block error rate of the user equipment, respectively, the transmission and the transmission quality threshold Poor quality threshold comparison, if the N-th block error rate of the user equipment transmission quality is less than the threshold, The judgment of the current transmission quality is better; if the first user equipment N block error rate is greater than the transmission quality Difference threshold, the judgment of the current transmission quality is poor.
7, as claimed in claim 6, characterized in that the transmission quality threshold for the purpose Standard block error rate and half the difference between the adjusted threshold hysteresis; poor quality of the transmission threshold for the target block error rate With half of the adjustment threshold and hysteresis.
8, as claimed in claim 6, characterized in that said step d11 No Maximum The number N of the user equipment covered are: 1 minus the difference between the target coverage of the multicast group and the total number of user equipment After the product of M obtained after rounding up an integer value;

The user equipment step d12 block error rate is: the number of correctly received divided by the positive response message The number of correctly received response message with an error response message is received and the number of the quotient obtained.
9, as claimed in claim 1,5,6,7 or 8, wherein the method is characterized in that said transmission parameter Therefore includes: transmitting power transmission format variables and the number of channels occupied by variables.
10, as claimed in any one of claim 5 to 8, wherein the method is characterized in that, in step d2, Adjust the transmission parameters at Node B before the pre-set parameters needed to be adjusted: Multicast service launch The maximum and minimum power, transmit power adjustment step size, transmission formats and variable step size The maximum number of channels occupied;

Said adjustment step d2 comprising the steps of:

d21, maintaining transmission format variable is 0, the number of channels occupied by the maximum value,

If the current transmission quality is better, in accordance with the transmit power step size decreases the transmission power value, Until the minimum transmit power, if the transmit power has been adjusted to the minimum value, the transmission quality is still However, better, step d22;

If the current transmission quality is poor, in accordance with the adjustment of transmit power increases the transmission power step value, Until the maximum transmit power, if the transmit power is adjusted to the maximum value, the transmission quality is still However poor, step d23;

d22, remain in the transmit power to a minimum, the number of channels occupied by the maximum value,

d22, remain in the transmit power to a minimum, the number of channels occupied by the maximum value,...

d22, remain in the transmit power to a minimum, the number of channels occupied by the maximum value,...

d23, remain in the transmit power is the maximum transmission format variable is 0,

If the current transmission quality is better, step places a value of 1 the value of the number of channels increases, the number of channels until The maximum number of channels if the variable has been adjusted to the maximum value, the transmission quality is still good, To step d21;

If the current transmission quality is poor, step places the value 1 value decreases the number of channels, until the number of channels The minimum number of channels if the variable has been adjusted to the minimum value, the transmission quality is still poor, Then returns to step d23.
11, as claimed in claim 1, characterized in that step d further comprises: Node B on multicast service for retransmission control;

The retransmission control in particular: an upper layer for the multicast service data block, the Node B After transmission of the n times, Node B statistical response message has not been sent correctly received the number of user equipment, If n is less than the preset maximum number of retransmissions, and not send a response message is received correctly The number of user devices within a multicast group ratio is greater than the total number of user devices in a data retransmission preset threshold, The retransmission of the data block; otherwise, Node B does not retransmit.