CN1741631A - Method for realizing multi broadcasting service - Google Patents
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- CN1741631A CN1741631A CNA2004100571235A CN200410057123A CN1741631A CN 1741631 A CN1741631 A CN 1741631A CN A2004100571235 A CNA2004100571235 A CN A2004100571235A CN 200410057123 A CN200410057123 A CN 200410057123A CN 1741631 A CN1741631 A CN 1741631A
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Abstract
A method of realizing multicast service includes confirming initial emitting parameter and transmitting parameter of multicast service before Node B sends data , sending transmission parameter to all UE in multicast set and sending multicast service data according to emitting parameter by Node B , receiving multicast service data according to transmission parameter and generating ACK / NACK information being up - sent to Node B as per received service data by each UE in multicast set , regulating emission parameter of multicast service by Node B according to correct receiving response / error receiving response information up - sent from UE .
Description
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 corresponding message number and mistake receive the corresponding 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 that realization of the present invention is many
Fig. 2 is the method schematic diagram of the dynamic channel number of adjusting transmitting power, transformat and taking in a preferred embodiment of the invention.
The specific embodiment
For making purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
For the UE of receiving multicast traffic, need predetermined this multicast service of at first registration, and with the registration business information leave the service center (BM-SC, Broadcast-Multicast Service Centre) of this BroadCast MultiCast Service in as the foundation of authentication. For example, the service center of MBMS need to be preserved all users' of registration MBMS business business information.
Further, in order to realize multicast service at the HSDPA channel, RNC also will be according to the business information of UE registration, be in the same residential quarter, in the same multicast group, the identical UE ID of all UE unified distributions, guarantee that all UE in the same multicast group can receive and the multicast service of demodulation registration.
Owing to 3GPP agreement regulation, the UE ID on the HSDPA channel is a special class UE ID for realization HSDPA functional definition, does not have other purposes, and therefore, by analysis, RNC is that UE different in the multicast group distributes identical UE ID not have other problem. In addition, the length of UE ID is 16 bits, can distribute to more than 60,000 user, and this numerical value is far longer than the user that Node B can support. Therefore, RNC and Node B can arrange, will be wherein a part of UE ID keep for multicast users, distribute in the scope of UE ID in this agreement of UE as RNC in, Node B just can know that this UE is multicast users.
The MAC-hs entity of Node B need to pre-determine the transmission opportunity of this multicast service before the down channel of HSDPA sends multicast service. In the prior art, the MAC-hs entity need to consider the data volume of business to be sent in each professional dispatching priority, its buffer area, each user's wireless channel environment, determine each user's comprehensive priority, thereby select the high business datum of priority preferentially to send. And for multicast service, all users can send CQI information and ACK/NACK information in the multicast group at up HS-DPCCH channel separately, and therefore, MAC-hs can not select data to send opportunity according to the unique user radio environment information.
In method of the present invention, the wireless channel environment that MAC-hs does not consider multicast service is set, be fixed as the average channel environment, in the transmission of selecting multicast service during opportunity, the dispatching priority of only considering this multicast service with and buffer area in the data volume of business to be sent, determine transmission opportunity of this multicast service.
Node B has determined just can send multicast service after transmission opportunity of multicast service. Fig. 1 has shown the flow process of realization multicast service of the present invention. As shown in Figure 1, the method for realization multicast service of the present invention specifically may further comprise the steps:
Step 101:Node B carried the signaling of transformation parameter in the HS-SCCH channel before sending multicast service; And behind 2 time slots, on the HS-PDSCH channel, transmit cast service data according to the initial transmissions parameter;
Whether wherein, transformation parameter comprises: the redundancy versions that the UE ID of multicast group, down channel code collection, modulation system, HARQ Process ID, coding adopt, be new data block, MAC-hs protocol Data Unit (PDU) block size;
Step 102: each UE monitors the HS-SCCH channel in the multicast group, if the entrained UE ID of the signaling of this channel conforms to the UE ID that distributes to self, then according to down channel code collection entrained in the signaling and modulation system to the information of corresponding HS-PDSCH channel receiving code chip level and carry out despreading, obtain the Physical layer bit information;
Step 103: the redundancy versions that this UE further adopts according to the entrained HARQ Process ID of signaling, coding, whether be the parameters such as new data block, MAC-hs PDU block size, obtain MAC-hs PDU from the bit information of Physical layer, and MAC-hs PDU carried out CRC check, result according to the CRC verification generates ACK/NACK information, if namely check results is correct, then generate ACK message; If the check results mistake then generates NACK message;
Step 104: UE is after beginning to receive 10.5 time slots of HS-PDSCH channel, in HS-DPCCH channel ACK/NACK information in the multicast group;
The MAC-hs entity of step 105:Node B is adjusted the emission parameter of this multicast service according to the ACK/NACK information that each UE in the multicast group uploads at the HS-DPCCH channel, and carries out Retransmission control.
This shows, method of the present invention has been passed through as all user assignments in the multicast group identical ID, realized that the user shares same HS-PDSCH transmission multicast service in the multicast group, compare with the prior art of using DPCH carrying multicast service, saved greatly Radio Resource.
Need to prove, above-mentioned steps 101, before the corresponding down channel code of HS-PDSCH channel collection transmission cast service data, the MAC-hs entity of Node B needs at first to determine this cast service data initial transmissions parameter, and these parameters comprise:
Initial Trans IntPwr, this parameter arranges suitable value by Node B according to the excursion of channel condition, the power that system's permission distributes, the quality of service of upper strata needs usually;
The descending HS-PDSCH channel code number ChaNum that takies, this parameter is positive integer, span is 1 to 15;
Transformat variable TbSize, this multicast service of this value representation used transformat when descending HS-PDSCH channel, this parameter is positive integer, span is 0 to 101.
Wherein, transformat variable TbSize is the self-defining variable of the present invention, and it has comprised modulation system information on the one hand, comprises on the one hand transport block size information. Stipulate according to the 3GPP agreement, when one timing of HS-PDSCH channel number, use QPSK modulation system and 16QAM modulation system that 63 kinds of transformats are arranged respectively, by transmission block size (Transport-block size) field notice user, value is 0 to 62 at the HS-SCCH channel. It is overlapped that 24 kinds of transformats are wherein arranged, and transformat always has 102 kinds like this. In addition, according to 3GPP agreement regulation, the indicated value of Transport-block size also is not the transmission block size of data actual transmissions on HSDPA down channel HS-PDSCH, but the index of a scope from 0 to 62. The 3GPP agreement provides a form, can according to this Transport-block size index and HS-PDSCH channel code number, modulation system, find the transmission block size of actual transmissions on the channel. Therefore, for easy to adjust, the present invention introduces transformat variable TbSize, and span is 0 to 101, comprises altogether 102 kinds of transformats, therefore can realize the unified of modulation system and Transport-block size adjusted. In a preferred embodiment of the invention, when TbSize is less than or equal to the maximum transport format variate-value MaxTbSizeIndForQPSK of the QPSK modulation system of predesignating, this the data QPSK modulation system is described, this moment, Transport-block size got TbSize; When and TbSize during greater than MaxTbSizeIndForQPSK illustrates this data 16QAM modulation system, this moment, transmission block size variable Transport-block size got TbSize-39. Wherein, the maximum transport format variate-value MaxTbSizeIndForQPSK when adopting the QPSK modulation system is the integer of span from 39 to 62, is an algorithm parameter that can dispose.
In order to guarantee the general wireless environment of method support of the present invention, in one embodiment of the invention, when determining initial transmissions, the transformat variable TbSize of this multicast service is 0; The descending HS-PDSCH channel code number ChaNum that takies is the HS-PDSCH channel yardage MaxChanNum according to the maximum of the peak rate setting of this multicast service; And Initial Trans IntPwr arranges suitable value by Node B according to the excursion of channel condition, the power that system's permission distributes, the quality of service of upper strata needs.
In addition, the method for above-mentioned steps 105 described adjustment multicast service emission parameters need to preset a judgement adjustment cycle parameter, and this parameter rule of thumb is worth setting by the MAC-hs entity of Node B.
The described dispatching algorithm of present embodiment is carried out once in each judgement adjustment cycle, and the method comprises following two steps:
The MAC-hs entity of step 201:Node B is adjusted judgement according to the ACK/NACK information that each UE in the multicast group uploads at the HS-DPCCH channel.
The MAC-hs entity of step 202:Node B is adjusted the channel number of down transmitting power, transformat and the transmission of this multicast service according to court verdict.
Above-mentioned steps 201 described adjustment judgements specifically may further comprise the steps:
The MAC-hs entity of step 2011:Node B determines that according to UE sum M in predefined CoverageTar and the multicast group this multicast service allows at most unlapped UE number N;
In this step, N can obtain by following formula calculating and through rounding up:
N＝(1-CoverageTar)×M
Wherein, the target coverage rate CoverageTar of multicast service, the UE number of this multicast service target coverage of this Parametric Representation is set according to the ratio that the good UE of covering accounts for UE sum M in the multicast group by the MAC-hs entity of Node B usually, is percentage;
The MAC-hs entity of step 2012:Node B all UE send in the statistics multicast group in a judgement adjustment cycle ACK message number AckCnt and NACK message number NackCnt, and calculate the block error rate BLER of each UE according to AckCnt and NackCnt;
In this step, each user's BLER is that NackCnt is divided by AckCnt and NackCnt sum; And for the transmission of same data block, if received the ACK message of certain UE, this UE does not participate in the calculating of this UE BLER for the feedback message of re-transmitting data block later on;
The MAC-hs entity of step 2013:Node B is arranged the BLER descending order of all UE in the multicast group, obtains the BLER of N UE, i.e. BLER-N;
N in this step equates with the N of calculating in the step 2011;
The MAC-hs entity of step 2014:Node B compares BLER-N respectively with the good thresholding of transmission quality (T-good) and poor transmission thresholding (T-bad), better if BLER-N, then adjudicates current transmission quality less than T-good; If it is relatively poor that BLER-N, then adjudicates current transmission quality greater than T-bad.
Wherein, T-good is that target Block Error Rate (BLERTar) and 1/2nd is adjusted the poor of thresholding sluggish (ThreHyst); T-bad be BLERTar and 1/2nd ThreHyst and;
BLERTar represents to guarantee the target Block Error Rate of this multicast service quality, is usually set according to the quality requirement of this multicast service by the MAC-hs entity of Node B, is percentage;
ThreHyst is used for setting the dead zone of going back to of adjusting thresholding, and avoids frequent adjustment, is usually rule of thumb set by the MAC-hs entity of Node B, is percentage.
So far, the MAC-hs entity of Node B obtains the court verdict of the current transmission quality of this multicast service according to the Block Error Rate of user in the multicast group, and namely Block Error Rate is higher, and transmission quality is poorer.
Above-mentioned steps 202 described adjustment are specially: Node B is divided into the emission parameter that three phases is adjusted respectively this multicast service according to the court verdict of step 201, i.e. transmitting power, transformat and the channel number that takies.
Fig. 2 is in a preferred embodiment of the invention, dynamically adjusts transmitting power, transformat and the method schematic diagram of the channel number that takies.
As shown in Figure 2, three solid lines among Fig. 2 represent respectively the three phases adjusted, and dotted line represents the transition between the three phases. The direction of arrow of solid line and dotted line represents through after the judgement among Fig. 2, the adjustment direction when transmission quality is relatively poor. Method of adjustment when transmission quality is better is the opposite direction of direction shown in Fig. 2 arrow. As shown in Figure 2, Node B is behind the initial transmissions multicast service, and the transmitting power adjusting stage that directly enters step 2021 begins to adjust, and described adjustment specifically may further comprise the steps:
Step 2021: the transmitting power adjusting stage, keeping transformat variable TbSize is 0, and the channel number ChaNum that takies is maximum, according to the court verdict of step 201, adjusts transmitting power,
If current transmission quality is better, then the adjustment step value PwrStep according to transmitting power reduces transmitting power, until the minimum M inPwr of transmitting power, if when transmitting power is adjusted to minimum of a value, transmission quality is still better, then enters the transformat TbSize adjusting stage of step 2022;
If current transmission quality is relatively poor, then the adjustment step value PwrStep according to transmitting power increases transmitting power, until the maximum MaxPwr of transmitting power, if when transmitting power is adjusted to maximum, transmission quality is still relatively poor, then enters the channel number ChaNum adjusting stage of step 2023;
Wherein, the maximum MaxPwr of transmitting power and minimum M inPwr represent maximum, the minimum emissive power of Node B on descending HS-PDSCH channel, rule of thumb are worth setting by Node B; The adjustment step-length PwrStep of transmitting power, the granularity that the MAC-hs entity of expression Node B carries out a power adjustment, the dB of unit rule of thumb is worth setting by Node B;
Step 2022: the transformat TbSize adjusting stage, the maintenance transmitting power is minimum of a value, and the channel number ChaNum that takies is maximum, according to the court verdict of step 201, adjusts transformat variable TbSize,
If current transmission quality is better, then increase the value of transformat variable TbSize according to the adjustment step value TbSizeStep of transformat, until the maximum 101 of transformat variable TbSize, if TbSize has adjusted at 101 o'clock at the transformat variable, transmission quality is still better, then no longer adjust, return step 2022;
If current transmission quality is relatively poor, then reduce the value of transformat variable TbSize according to the adjustment step value TbSizeStep of transformat, until the minimum of a value of transformat variable TbSize, if TbSize has adjusted at 0 o'clock at the transformat variable, transmission quality is still relatively poor, then enter the transmitting power adjusting stage of step 2021, adjust transmitting power;
Wherein, the transformat variable is adjusted step-length TbSizeStep and is represented that the MAC-hs entity of Node B carries out the granularity of a transformat adjustment, is positive integer, rule of thumb is worth setting by Node B.
Step 2023: the channel number ChaNum adjusting stage, the maintenance transmitting power is maximum, and form variable TbSize is 0, according to the court verdict of step 201, adjusts the channel number ChaNum that takies,
If current transmission quality is better, then increase channel number ChaNum value with step value 1, until the maximum MaxChanNum of channel number ChaNum, if when channel number variable ChaNum has adjusted to maximum, transmission quality is still better, then enter the transmitting power adjusting stage of step 2021, adjust transmitting power;
If current transmission quality is relatively poor, then reduce channel number ChaNum value with step value 1, until the minimum of a value of channel number ChaNum, if when channel number variable ChaNum has adjusted to minimum of a value, transmission quality is still relatively poor, then no longer adjusts, and returns step 2023.
Because transformat has defined the modulation system of cast service data and actual transmission block size, therefore can adjust for data actual speed rate and redundant degree by adjusting transformat, be that transmission block is less, redundant just larger, Block Error Rate will reduce accordingly; Transmission block is larger, and redundant just less, data rate is just higher, and the transformat of therefore adjusting multicast service just is equivalent to adjust transmitting power.
In addition, the channel number that takies represents the descending code channel number that this multicast service is shared, because the descending general power of this cast service data is certain, namely the channel number that takies of this multicast service is more, the power of each channel is just less, therefore, adjust the channel number that this multicast service takies, also suitable and multi-emitting power is adjusted.
In an embodiment of the present invention, Node B need to regulate the speed according to pace of change and the actual of excursion and permission of actual BLER, suitable ThreHyst, judgement adjustment cycle, PwrStep and TbSizeStep are set, to satisfy simultaneously the requirement of adjusting smoothness and regulating the speed.
The above analysis, 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, preferably in the situation, reduce transmitting power at channel transmission quality, simultaneously can increase descending transfer rate, realize high speed data transfer. The channel number that method of adjustment of the present invention can be adjusted 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.
Owing to comprised the HARQ agreement in the existing HSDPA agreement, this HARQ protocol definition the automatic retransmission mechanism of MAC-hs entity after receiving the NACK message of UE of Node B. Because existing HARQ agreement all is to set up on the basis of point-to-point communication, the corresponding operating that the MAC-hs entity of therefore not considering Node B need to carry out in the time of can't correctly receiving this cast service data for some UE in the multicast group.
A preferred embodiment of the present invention has provided the retransmission mechanism of application and multicast service. The described retransmission mechanism of present embodiment is specially: for the cast service data piece on a upper strata, in the MAC-hs of Node B entity transmission after n time, Node B statistics does not also have correct receive data and sends the UE number of ACK message, and is set to NoAckCnt. If n, then retransmits this data block greater than data re-transmission thresholding BlerThd less than the ratio of total UE number in MaxTranNum and NoAckCnt and the multicast group; Otherwise the MAC-hs entity of Node B no longer retransmits.
Wherein, data re-transmission thresholding BlerThd, this parameter is percentage, is arranged according to target block error rate BLER Tar by Node B; Maximum transmission times MaxTranNum is positive integer, and the mean value of BLER, BlerThd do not arrange when being retransmitted by Node B basis, needs to guarantee that the MaxTranNum power of BLER mean value is less than BlerThd.
Stipulate according to the 3GPP agreement, UE is on monitoring the HS-SCCH down channel during signaling, if detecting the fast directive of new data (New-data indicator), to indicate this data block be not new data block, and this UE has correctly received previous data block, responded ACK message, then this UE will not process the data block of this transmission. Like this, just guaranteed in above-mentioned retransmission mechanism, also can not affect the user who has correctly received even retransmit.
Can be found out that by said method retransmission mechanism of the present invention has solved the problem that multicast service retransmits in the multicast group, in the situation that number of users is moderate in the multicast group, further improve efficiency of transmission.
More than lift preferred embodiment; the purpose, technical solutions and advantages of the present invention have been carried out further detailed description; institute is understood that; the above is the preferred embodiments of the present invention; not in order to show the present invention; within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, a kind of method that realizes multicast service is characterized in that, 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.
2, the method for claim 1, it is characterized in that, 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.
3, the method for claim 1 is characterized in that, the described initial transmissions parameter of step a comprises: Initial Trans, transformat variable and the channel number that takies.
4, the method for claim 1, it is characterized in that described 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, whether be the transmission block size parameter of the protocol Data Unit of new data block, MAC-hs.
5, the method for claim 1 is characterized in that, 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.
6, method as claimed in claim 5 is characterized in that, 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 corresponding message number and mistake receive the corresponding 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.
7, method as claimed in claim 6 is characterized in that, the good thresholding of described 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.
8, method as claimed in claim 6 is characterized in that, 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.
9, such as claim 1,5,6,7 or 8 described methods, it is characterized in that described emission parameter comprises: transmitting power, transformat variable and the channel number variable that takies.
10, such as each described method of claim 5 to 8, it is characterized in that, 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.
11, the method for claim 1 is characterized in that, 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.
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