CN101529783A - Mbms data transmission and receiving in packet based on cellular system - Google Patents
Mbms data transmission and receiving in packet based on cellular system Download PDFInfo
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Abstract
The invention provides a method for transmitting and receiving multimedia broadcast multicast service (MBMS) data in a packet based cellular system. The method for transmitting multimedia broadcast multicast service (MBMS) to a plurality of mobile stations in a packet based cellular system, includes the steps of : a) transmitting scheduling information of transmission data, b) hybrid automatic repeat request (HARQ) information, and a service group identifier (ID) for MBMS to the mobile stations through a MBMS dedicated control channel; b) transmitting information about a dedicated feedback channel of a mobile station and unique scrambling codes different by cells and mobile stations to the mobile stations; c) transmitting a MBMS data packet to the mobile station; d) transmitting radio resource information of data retransmitted using a downlink control signal to the mobile stations if negative acknowledgment (NACK) is received from at least one of the mobile stations; and e) transmitting the retransmitted data to the mobile stations.
Description
Technical field
The present invention relates to be used for transmit and the method for receiving multimedia broadcast multicast service (MBMS) data at packet-based cellular system; And more specifically, relate to be used for using mixed automatic retransmission request (HARQ) scheme at packet-based cellular system based on putting multiple spot transmitted and received method from the MBMS data to a plurality of mobile radio stations.
Background technology
Multimedia broadcast multicast service (MBMS) is the broadcast service that provides to a plurality of mobile radio stations by mobile communications network.Yet, because the decline and the interference signal of radio channel make when signal is propagated by radio channel the various errors of generation in signal.
Mobile communication system is used one of automatic re-send request may (ARQ) scheme, forward error correction scheme and mixed automatic retransmission request (ARQ), so that correction error.
ARQ scheme and HARQ scheme are to transmit data under one the prerequisite at all receivers of hypothesis, and are that success receives data or do not receive data by the feedback channel notice.The ARQ scheme can generate long delay, because the reception that the ARQ scheme is divided into groups by the feedback channel report data after receiving a plurality of packets.
The HARQ scheme is passed through data retransmission and the error correcting code of carrying out physical layer simultaneously, and improves error correcting capability.That is the HARQ scheme packet of error that do not abandoned previous generation.The HARQ scheme has the packet of error to the error correction decoder input, so that improve error correcting capability when the packet that decoding retransmits.Since in general only the grouping a part in generated error, so do not abandon grouping, then improved error correcting capability with error if having the grouping input decoder of error.
Want data quantity stored significantly to increase, to use the error correcting code of physical layer.Want data quantity stored in order to reduce, the HARQ scheme is notified whether generated error rapidly in data by feedback channel, and carries out re-transmission fast.
The HARQ scheme generally is divided into steadily increase redundancy (IR) method and follows the trail of and merges (CR) method.The IR method is added parity check bit to the data that will retransmit when data retransmission, so that obtain the gain of chnnel coding.The CR method retransmits and the previous the same data of data that transmit.Although the IR method is better than CR method at aspect of performance, the IR method has its receiver and has the more shortcoming of high complexity than the receiver of CR method.Although the CR method is better than IR method aspect the receiver complexity, the CR method has the shortcoming of its performance than the poor performance of RI method.
In the 3rd generation partnership projects (3GPP) Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, for example the broadcast service of MBMS uses the error correcting code (and not using ARQ scheme or HARQ scheme) of for example forward error correction to come correction error in application layer.When simultaneously when the same MBMS data are transmitted in a plurality of sub-districts, mobile radio station obtains higher signal by the signal that merges a plurality of sub-districts, so that reduce the possibility that error generates.As the method for the signal that merges a plurality of sub-districts, in the 3GPP standard, stipulated soft combination method and selected the merging method.Yet, under situation, only use error correcting code to come correction error, because the WCDMA system can not use soft combination method and select the merging method according to the single cell MBMS service in the WCDMA system of prior art.
So single cell MBMS service has lower error correction efficient.
If the number of the mobile radio station of reception broadcast service is smaller, then the WCDMA system transmits the MBMS data based on point-to-point to mobile radio station.
On the contrary, if the number of the mobile radio station of reception broadcast service is bigger, then the WCDMA system transmits the MBMS data based on putting multiple spot to mobile radio station.
In other words,, then will put multipoint iterations and switch to the point-to-point method, generate more interference at the neighbor cell place because put multipoint iterations to transmit the MBMS data according to the WCDMA system of prior art if the number of mobile radio station is smaller.
In general, put multipoint iterations and use auxiliary Common Control Channel (S-CCPCH), and the point-to-point method is used DPCH (DPCH).Because the S-CCPCH channel uses the about 5% to 10% of base station power, uses ample resources so put multipoint iterations.
On the contrary, the DPCH channel uses and is lower than 5% of power.
So,, can use less power by increasing according to radio channel state or reducing power.
The base station needs the information about the number of the mobile radio station that receives broadcast service, switches to the point-to-point method so that will put multipoint iterations.In general, when the base station initially provides when service, base station selected point-to-point method and put one of multipoint iterations and transmit data.When the number of mobile radio station owing to transferring (handover) when changing, the number of mobile radio station is reaffirmed in the base station, and selects transfer approach based on the number of the mobile radio station of inspection.
The number of confirming mobile radio station in the starting stage of service is called as counting to be handled, and the number of confirming mobile radio station in the intermediateness of service is called as again counting and handles.When the base station was carried out the counting processing or counted processing again, handled or counting processing again to the mobile radio station notifications count base station.Then, mobile radio station wants to receive service by inserting at random to base station notice mobile radio station.Yet, insert at random and use limited code, if carrying out at random simultaneously, a plurality of mobile radio station inserts, can clash.Use by the mobile radio station that receives MBMS owing to insert not only at random, so the conflict that inserts at random need be controlled in the base station.For control hazard, the test probability is inserted at random to the mobile radio station notice in the base station.The base station is continued management and is inserted the test probability at random, and upgrades access test probability at random according to the state of the mobile radio station in the sub-district.
In MBMS, can use the point-to-point method and put one of multipoint iterations and transmit data.Yet, point-to-point method and put multipoint iterations and in the operation of feedback channel, have difference.That is, in the point-to-point method, a mobile radio station uses feedback channel to send and replys.On the contrary, in putting multipoint iterations, a plurality of mobile radio stations use feedback channel to send and reply.That is, in putting multiple spot, a plurality of mobile radio stations use feedback channel to transmit simultaneously and reply.So,, then use a large amount of Radio Resources if in putting multipoint iterations, distribute feedback channel to provide MBMS to a large amount of mobile radio stations to each mobile radio station.
So, need exploitation a kind of when in packet-based cellular system, making resource use minimized method when multipoint iterations provides MBMS based on putting.And, need exploitation a kind of when in packet-based cellular system when putting multipoint iterations MBMS be provided employing HARQ scheme receive the method for the MBMS with low packet error rate.
Summary of the invention
Embodiments of the invention aim to provide a kind of data receiving-transmitting method, be used at packet-based cellular system based on putting multipoint iterations when a plurality of mobile radio stations transmit the MBMS data, reduce the reception error rate by the automatic re-send request may of application mix (HARQ) scheme, make resource use simultaneously and minimize.
Other purposes of the present invention and advantage can be understood by following description, and become clear by the reference embodiments of the invention.And, for those skilled in the art in the invention, it is evident that, can realize objects and advantages of the present invention by claimed parts and combination thereof.
According to an aspect of the present invention, provide a kind of being used for to transmit the method for multimedia broadcast multicast service (MBMS) to a plurality of mobile radio stations, may further comprise the steps: the service groups identifier (ID) that a) transmits schedule information, mixed automatic retransmission request (HARQ) information and the MBMS of data to mobile radio station by the MBMS Dedicated Control Channel at packet-based cellular system; B) transmit the dedicated feedback channel of relevant mobile radio station and at the information of the sub-district unique scrambler different to mobile radio station with mobile radio station; C) transmit the MBMS packet to mobile radio station; D) if at least one from described mobile radio station receives negative really receive (NACK), then transmit the radio resource information of the data of using the downlink control signal re-transmission to mobile radio station; And e) transmits the data that retransmit to mobile radio station.
According to a further aspect in the invention, provide a kind of being used for to may further comprise the steps: the service groups identifier that a) transmits schedule information, HARQ relevant information and the MBMS of data by the MBMS Dedicated Control Channel in the method for packet-based cellular system to a plurality of mobile radio stations transmission MBMS; B) transmit the common common feedback channel that uses of relevant mobile radio station and the information of at least one scrambler to mobile radio station; C) transmit the MBMS packet to mobile radio station; D) when from described mobile radio station at least one receives NACK, then transmit the radio resource information of using the data that downlink control signal retransmits; And e) transmits the data that retransmit to mobile radio station.
According to a further aspect in the invention, a kind of method that is used for receiving at packet-based cellular system the MBMS data that transmit to a plurality of mobile radio stations is provided, has may further comprise the steps: a) received schedule information, HARQ relevant information and the group identifier that transmits data by the MBMS Dedicated Control Channel; B) receive the feedback channel of relevant each mobile radio station distribution and at the information of sub-district unique scrambler different with mobile radio station; C) receive the MBMS data; D) transmit the crc error check result of the MBMS data that are used to receive by this dedicated feedback channel; E) radio resource location of the data that receive to retransmit by downlink control signal; And f) receives the data of this re-transmission.
According to a further aspect in the invention, a kind of method that is used for receiving at packet-based cellular system the MBMS data that transmit to a plurality of mobile radio stations is provided, has may further comprise the steps: the service groups identifier that a) receives schedule information, HARQ relevant information and the MBMS of the transmission data of passing through the MBMS Dedicated Control Channel by the MBMS Dedicated Control Channel; B) receive the common common feedback channel that uses of relevant mobile radio station and the information of at least one scrambler; C) receive the MBMS packet; D) transmit the crc error check result of the MBMS data that are used to receive by this common feedback channel; E) radio resource location of the data that receive to transmit by downlink control signal; And f) receives the data of this re-transmission.
According to a further aspect in the invention, a kind of method that is used for receiving at packet-based cellular system the MBMS that transmits to a plurality of mobile radio stations is provided, has may further comprise the steps: the service groups identifier that a) receives the schedule information, HARQ relevant information and the MBMS that transmit data by the MBMS Dedicated Control Channel; B) receive the common common feedback channel that uses of relevant mobile radio station and the information of at least one scrambler; C) receive the MBMS packet; D) if the MBMS data that receive have crc error, then confirm the information of the feedback channel of relevant base station assigns; E) the decoding downlink control signal and does not transmit the crc error check result, and if the data retransmission in the downlink control signal of radio resource location and decoding relevant, then receive this data retransmission; F) transmit the crc error check result of the MBMS data that received by this common feedback channel; G) receive the radio resource location of data retransmission by downlink control signal; And h) receives this data retransmission.
In packet-based cellular system, transmitting and receiving in the method for MBMS data according to of the present invention, to the cell-radio network time identifier (C-RNTI) of the mobile radio station distribution that receives MBMS, make that thus mobile radio station can the receiving downlink control signal as unique service groups identifier.This downlink control signal comprises the resource information of data retransmission and is used for the resource information of the feedback channel of data retransmission.
In packet-based cellular system, transmitting and receive in the method for MBMS data according to of the present invention, a plurality of unique feedback channels are provided in the sub-district, generate large disturbance so that prevent the feedback channel that uses in the sub-district.
In packet-based cellular system, transmitting and receiving in the method for MBMS data according to of the present invention, although used a plurality of feedback channels, if but generated the large disturbance signal from feedback channel, then the base station uses the probability of feedback channel to control this interference.
In packet-based cellular system, transmitting and receive in the method for MBMS data, transmit the MBMS data based on putting multipoint iterations, and do not carry out the complicated handover operation that for example switches to the point-to-point method according to of the present invention.
Embodiment
By the following description of with reference to the accompanying drawings embodiment being carried out of illustrating later, it is clear that advantage of the present invention, feature and aspect will become.
Fig. 1 and 2 illustrates the block diagram of whether having used MBMS network of the present invention.That is, Fig. 1 and 2 shows 3GPP LTE UTRAN system, and wherein 3GPP LTE UTRAN represents the 3rd generation partnership projects Long Term Evolution UMTS terrestrial radio Access Network, and UMTS represents Universal Mobile Telecommunications System.
With reference to Fig. 1 and 2, the MBMS network comprises the service transducer BM-SC 10 that is used to provide multimedia broadcast multicast service (MBMS), as the MBMS gateway GW 20 of MBMS dedicated gateway, be used to support IAD aGW 30 and base station eNB 40 as the unicast services of non-MBMS.The MBMS network also comprises the MBMS coordination entity MCE 60 of the transmission that is used to dispatch the MBMS grouping.In other words, MBMS coordination entity MCE 60 is connected to MBMS gateway 20 and base station 40, manages the base station in a plurality of sub-districts, and management transmits the MBMS packet scheduling by the sub-district.
In Fig. 1 and 2, MBMS gateway 20 separates with IAD 30.Yet MBMS gateway 20 and IAD 30 can be by whole implementation.
In general, MBMS service transducer BM-SC 10 adopts real-time protocol (rtp) and User Datagram Protoco (UDP) (UDP).RTP comprises error correcting encoder, and UDP comprises verification and generator.
From level angle, the Radio interface protocols of base station 40 and mobile radio station 50 is made of physical layer, data link layer and network layer.From vertical angle, Radio interface protocols is made of the control panel that the Users panel that is used for data information and being used to transmits control signal.Based on following three layers in the OSI(Open Systems Interconnection) master pattern that is widely known by the people in the communication system, protocol layer can be classified as ground floor L1, second layer L2 and the 3rd layer of L3.
Use physical channel to provide information transfer service as the physical layer of ground floor to the upper strata.Physical layer is connected by medium access control (MAC) layer and transmission channel.Data are transmitted between MAC layer and physical layer by transmission channel.
MAC layer as the second layer provides information transfer service by logic channel to radio link control (RLC) layer.Rlc layer is supported authentic data to transmit and is carried out segmentation and the serial connection function in from the RLC service data unit (SDU) on upper strata.
Rrc layer as the lowermost layer in these three layers only defines in control panel.Rrc layer control logic channel, transmission channel and with the configuration of radio bearer, reconfigure and discharge relevant physical channel.
PDCP (PDCP) can be installed on the rlc layer, is used for compression and expanded packet header.
The MBMS data 40 are sent to mobile radio station 50 by MBMS gateway 20 from the base station.The physical layer of mobile radio station 50 receives the data of passing radio channel, the data that receive is decoded, and check the Cyclic Redundancy Check error.
According to 3GPP version-6TS25.322, as the rlc layer of sender's base station 40 by merging or segmentation service data cell (SDU) generates protocol Data Unit.Here, for example the communication system of MBMS system comprises several agreements.SDU represents to import data cell, and PDU represents outputting data elements.
When MBMS carried out, base station eNB 40 was judged the size of PDU.When SDU is imported into rlc layer, if SDU greater than PDU, then the base station is divided into SDU the size that is not more than PDU.If the previous SDU maintenance that receives is what to be divided, then the base station is connected in series with the SDU of current reception by the SDU that will before arrive and generates PDU.
After the PDU process MAC layer that the rlc layer place generates, add the CRC bit to PDU.Then, PDU is encoded, and is sent to mobile radio station by radio channel.
The physical layer of mobile radio station is carried out the CRC check processing that channel-decoding is handled, determined whether to have generated in packet place error, and CRC check result and the packet except the CRC bit are delivered to rlc layer by the MAC layer.
The system based on 3GPP LTE that is used for non-MBMS service uses Dedicated Control Channel (DCCH) and Dedicated Traffic Channel (DCCH) as logic channel.Transmit control signal by DCCH, and transmit data by DTCH as Dedicated Traffic Channel as Dedicated Control Channel.
The MBMS service uses multicast control channel (MCCH) and MBMS Traffic Channel (MTCH) as logic channel.
Transmit control signal by MCCH, and transmit data by MTCH as MBMS data dedicated channel as the MBMS Dedicated Control Channel.
The downlink control signal of L1/L2 control signal transmits and receives the time of data and the schedule information of frequency to packet-based cellular system about for example using to the mobile radio station notice.Down link means the link from the base station to the mobile radio station.
In general, down link data begins to transmit when transmitting the control signal of L1/L2 control signal for example.And the control information of relevant a plurality of mobile radio stations can transmit simultaneously by downlink control signal.The space that is used to distribute to each control signal of corresponding mobile radio station can use the identifier of this correspondence mobile radio station to identify.So mobile radio station must be known the identifier that oneself distributes to it, with the receiving downlink control signal.Identifier is called as cell-radio network time identifier (C-RNTI).This identifier can be by unique mobile radio station that is assigned to, and perhaps group identifier can be assigned to a plurality of mobile radio stations.
Under the situation of unicast services, packet-based cellular system uses mixed automatic retransmission request (HARQ) scheme.Unicast services right and wrong MBMS service.In more detail, down link data is transmitted to mobile radio station in the base station.Mobile radio station receives the data from the base station, and whether report successfully receives data to the base station by uplink feedback channel.Then, which resource the base station notifies be used as feedback channel at the initial point of service to mobile radio station.And, can judge the position of feedback channel according to the radio resource that is used for transmitting the L1/L2 control signal to mobile radio station.In general, mobile radio station was pass by the scheduled time after the base station receives data after, mobile radio station used specified frequency and given feedback channel.
Here, the position of feedback channel can be static or can be dynamically to change.If feedback channel is static, then mobile radio station uses the resource that is judged as feedback channel in the starting stage of service by the base station.If feedback channel dynamically changes, then the information of relevant feedback channel is notified in the base station to mobile radio station.
When mobile radio station successfully received the data that do not have error, mobile radio station transmitted to the base station by feedback channel and really receives ACK as affirmative acknowledgement.If when not receiving the data that do not have error, then mobile radio station transmits the negative NACK that really receives by feedback channel to the base station.
Fig. 3 is the figure in packet-based cellular system transmission MBMS data that is used for describing according to the embodiment of the invention.The MBMS packet can be sent to a plurality of mobile radio stations from single base station.And the MBMS packet can be sent to a plurality of mobile radio stations from a plurality of base stations.That is, transmit identical MBMS packet from a plurality of base stations to a plurality of mobile radio stations.Mobile radio station receives the MBMS data that transmit simultaneously from a plurality of base stations as a signal.Use description to from base station transmit the method and the method that is used for transmitting the MBMS packet of MBMS packet from a plurality of base stations thereafter.
The method that is used for transmitting from single base station the MBMS packet can be different with the method that is used for transmitting from a plurality of base stations the MBMS packet in the operating aspect of feedback channel.For example, when the MBMS packet is transmitted in single base station, distribute feedback channel to each mobile radio station.The feedback channel that distributes to each mobile radio station is a dedicated feedback channel.When the MBMS packet is transmitted in a plurality of base stations, not to each channel allocation feedback channel.That is, a plurality of mobile radio stations are shared feedback channel.Such channel is called as the common feedback channel.In this case, the base station can have one or more common feedback channels.When the base station had a plurality of common feedback channel, the common feedback channel can be distributed changeably according to the number and the radio channel-environment of mobile radio station in the base station.The BTS management feedback channel.The information of relevant feedback channel is transmitted in the base station to mobile radio station in the MBMS service starting stage.In the time must changing feedback channel, the information of the relevant feedback channel that changes is also transmitted in the base station to mobile radio station.
In addition, the information of relevant scrambler is transmitted to mobile radio station in the base station, and each mobile radio station uses this information to be used for transmitting really by feedback channel in the MBMS service starting stage and receives.In other words, scrambler is by the code of base station assigns in order to reduce the interference between mobile radio station when mobile radio station transmits the signal be used to notify reception and whether comprises replying of error by feedback channel.
Transmitting the method for MBMS packet from single base station, the scrambler difference at each place, base station, and to the different unique code of each mobile radio station distribution.That is, negate the true time receiving when the base station receives from mobile radio station, the base station must have the ability of each mobile radio station in the sign respective cell.In order to identify, the scrambler that needs each cell allocation to identify.For example, scrambler is the code that multiplies each other and obtain by with uniform amplitude zero auto-correlation (CAZAC) sign indicating number and hada (hadamard:HD) sign indicating number.CAZAC sign indicating number identifying cells and mobile radio station, and HD sign indicating number sign is used the mobile radio station of several codes, reduces thus and disturbs.
Transmitting the method for MBMS packet from a plurality of base stations, the scrambler and the nonessential difference at each place, base station, and do not distribute unique code to each mobile radio station.Transmitting the method for MBMS packet from a plurality of base stations, the base station provides one or more scramblers to each mobile radio station.Providing under the situation of a plurality of scramblers, each mobile radio station can be selected one of scrambler at random.
With reference to figure 3, in step S301, the Dedicated Control Channel of base station by for example MCCH and the transmission channel that is mapped to the control channel of being judged transmit the group identifier of schedule information, HARQ relevant information and MBMS that the data of relevant MBMS service starting stage transmit to mobile radio station.From the method for single base station transmits MBMS packet, be used as Dedicated Control Channel as the MCCH of logic channel, and downlink sharied signal channel (DL-SCH) is used as the transmission channel that is mapped to MCCH.Transmitting the method for MBMS packet from a plurality of base stations, MCCH is used as Dedicated Control Channel, and Multicast Channel (MCH) is used as the transmission channel that is mapped to MCCH.Schedule information and HARQ relevant information and group identifier are the common information that receives at the mobile radio station place.So Dedicated Control Channel MCCH must repeat to transmit according to regular periods, so that mobile radio station can receive MBMS.In the present embodiment, MCCH is repeated to transmit according to the rule time interval in the base station.
And the base station is transmitted feedback channel information and scrambling code information in the MBMS service starting stage to each mobile radio station.Transmitting from the base station the method for MBMS packet, base station selected mobile radio station judge feedback channel in the lump so that distribute the feedback channel of being judged to selected mobile radio station.Then, when mobile radio station received the MBMS data, the radio resource location of relevant dedicated feedback channel and the information of scrambler were transmitted to each mobile radio station in the base station.Transmitting the method for MBMS packet from a plurality of base stations, the feedback channel that will use is judged in the base station, and transmits common feedback channel information and scrambling code information in the MBMS service starting stage to mobile radio station.
The schedule information that is used for the data transmission comprises the radio resource information that is used to receive data.The group identifier of MBMS can be the C-RNTI that the base station keeps and distributes.In other words, the base station keeps and divides the C-RNTI that is used in MBMS, and mobile radio station uses the C-RNTI that distributes to come receiving downlink control signal (the L 1/L2 control signal that is used for MBMS).
When packet-based cellular system is supported steadily increase redundancy (IR) method and followed the trail of when merging (CR) method, the HARQ relevant information comprises about one of the IR method that will use and CR method, how to use each in IR method and the CR method and the information of the maximum number that will retransmit.If packet-based cellular system is only supported one of IR method and CR method, then the HARQ relevant information does not comprise about the IR method that will use and the information of the method selected in the CR method.
If necessary, then the MCCH control information that comprises NACK feedback probability can be transmitted in the base station.Although NACK feedback probability be used to control use as mentioned above scrambler by feedback channel transmit NACK, but when between mobile radio station, generating the large disturbance signal, the information of the probability by feedback channel transmission NACK still at the mobile radio station place.Transmitting the method for MBMS packet from single base station, can not use NACK feedback probability.
After transmitting schedule information, group id information and HARQ relevant information, the MBMS packet is transmitted to mobile radio station in the base station in step S302.Transmitting the method for MBMS packet from single base station, MTCH is used as logic channel, and DL-SCH is used as the transmission channel that is mapped to MTCH.Transmitting the method for MBMS packet from a plurality of base stations, MTCH is used as logic channel, and MCH is used as the transmission channel that is mapped to MTCH.
The physical layer of mobile radio station is carried out CRC for the packet that transmits from the base station and is handled.If the discovery crc error, then mobile radio station feedback channel by base station assigns in step S303 transmits NACK to the base station.This feedback channel is a dedicated feedback channel the method that transmits the MBMS packet from single base station, and this feedback channel is the common feedback channel the method that transmits the MBMS packet from a plurality of base stations.When mobile radio station transmits when replying to the base station, mobile radio station uses the scrambler that transmits from the base station to carry out scrambling to replying, and transmits replying after the scrambling by the feedback channel that distributes.
Although the method that transmits the MBMS packet from single base station, use scrambler,, then can select and use one of scrambler at random if the method that transmits the MBMS packet from a plurality of base stations, provide a plurality of scramblers to the unique distribution of each mobile radio station.In other words, if a plurality of mobile radio station transmits NACK by feedback channel to the base station simultaneously, then signal becomes significantly bigger, is operating as the large disturbance for other sub-districts thus.In order to reduce the interference in the present embodiment, when mobile radio station transmits NACK by feedback channel, provide a plurality of scramblers, so that one of scrambler that provides to be provided to mobile radio station.Mobile radio station is selected one of scrambler at random, uses the scrambler of selecting that NACK is carried out scrambling, and by the NACK after the feedback channel transmission scrambling.Therefore, fifty-fifty, it is bigger that signal can not become, because the signal between the mobile radio station becomes at random.So signal can not disturb other sub-districts.
Under the situation of no crc error, mobile radio station can transmit ACK or can not transmit ACK.Transmitting the method for MBMS packet from a plurality of base stations, if do not find crc error, then mobile radio station does not preferably transmit ACK by the common feedback channel.
If the base station receives NACK by feedback channel from mobile radio station, then the base station has the radio resource location of the data retransmission of error by downlink control signal to the mobile radio station notice in step S304.
If the base station receives NACK from mobile radio station the method that transmits the MBMS packet from a plurality of base stations, then the necessity of upgrading the NACK feedback probability factor is checked by detecting the interference volume of common feedback channel in the base station.Then, upgrade the NACK feedback probability factor if desired, then the base station is upgraded the NACK feedback probability factor and is passed through the factor of Dedicated Control Channel MCCH after mobile radio station transmits renewal.
Although if the scrambler scrambling NACK that use to select as mentioned above and transmit scrambling after NACK, but the large disturbance signal still takes place, then the base station uses NACK feedback probability to control interference signal does not take place.The base station is transmitted NACK feedback probability by MCCH to mobile radio station.Mobile radio station uses the probability of NACK feedback probability calculation by the feedback channel transmission NACK of oneself.Based on the probability that calculates, mobile radio station can transmit NACK or can not transmit NACK by feedback channel.
After transmitting the radio resource location of this data retransmission by downlink control signal, the base station is transmitted this data retransmission by transmission channel to mobile radio station in step S305.Transmitting the method for MBMS packet from single base station, downlink sharied signal channel (DL-SCH) is used as transmission channel.Transmitting the method for MBMS packet from a plurality of base stations, the MCH channel is used as transmission channel.
In the present embodiment, data retransmission is distributed on several frequencies and is transmitted, rather than specifies preset frequency to transmit data retransmission, gives mobile radio station big frequency diversity so that prevent data retransmission.
Therebetween, mobile radio station uses MBMS service groups ID to find to distribute to the position of the downlink control signal (L1/L2 control signal) of MBMS, and this MBMS service groups ID is for example C-RNTI that the base station keeps and distributes and transmit by Dedicated Control Channel.In general, mobile radio station can be decoded several times to the control signal position, is used to find the position of downlink control signal.In the present embodiment, in the scheduled time after mobile radio station transmits NACK by feedback channel, the position of transmitting downlink control signal at place, preset frequency space is so that reduce the decoding complexity of mobile radio station.
Mobile radio station uses the radio resource location that obtains by downlink control signal to receive the data retransmission that transmits by transmission channel, and the data retransmission that receives is carried out CRC handle.Mobile radio station can be carried out the above-mentioned processing that is used for transmitting by feedback channel NACK repeatedly according to the CRC check result.And if necessary, if for example the MCCH control information changes, then mobile radio station is by Dedicated Control Channel MCCH receiving control information.
Fig. 4 is the flow chart that is used for transmitting at the place, base station the method for MBMS data according to the embodiment of the invention.That is, Fig. 4 shows the method that is used for transmitting from a plurality of base stations the MBMS data.
With reference to figure 4, the base station is transmitted with data transmission relevant schedule information, HARQ relevant information and MBMS group ID C-RNTI with the transmission channel that is mapped to MCCH to mobile radio station by Dedicated Control Channel MCCH in step S401.Transmitting the method for MBMS packet from single base station, downlink sharied signal channel (DL-SCH) is used as the transmission channel that is mapped to position channel MCCH.And, transmitting the method for MBMS packet from a plurality of base stations, the MCH channel is used as the transmission channel that is mapped to position channel MCCH.Dedicated Control Channel MCCH is transmitted at interval repeatedly according to rule in the base station.
And the starting stage is served to the information of mobile radio station transmission about feedback channel that will use and the scrambler that will use at MBMS in the base station in feedback channel.
Transmitting the method for MBMS packet from a plurality of base stations, can transmit NACK feedback probability to mobile radio station by Dedicated Control Channel MCCH.
After transmitting schedule information, group id information and HARQ relevant information, the MBMS packet is transmitted to mobile radio station in the base station in step S402.Transmitting the method for MBMS packet from single base station, MTCH is used as logic channel, and DL-SCH is used as the transmission channel that is mapped to MTCH.Transmitting the method for MBMS packet from a plurality of base stations, MTCH is used as logic channel, and the MCH channel is used as the transmission channel that is mapped to MTCH.
After having transmitted the MBMS packet, if the base station receives NACK by feedback channel from mobile radio station in step S403, then the interference volume of feedback channel is detected in the base station in step S404, and checks the necessity of upgrading the NACK feedback probability factor in step S405.If need to upgrade feedback probability factor in step S406, then the probability factor of the Dedicated Control Channel MCCH of update rule transmission is come by upgrading feedback probability factor in the base station in step S407.The method that transmits the MBMS packet from single base station, can omit the operation of upgrading feedback probability factor.
In step S408, the base station is to the radio resource location of mobile radio station notice data retransmission, so that retransmit the MBMS packet that has generated error.Downlink control signal is transmitted to the preset frequency space in the scheduled time after mobile radio station transmits NACK by feedback channel in the base station.
Then, the base station is transmitted data retransmission by transmission channel to mobile radio station in step S409.The base station is distributed in data retransmission on several frequencies, and transmits the data retransmission that is distributed that is used to transmit data, to give the mobile radio station frequency diversity.
Therebetween, transmitting the method for MBMS packet from a plurality of base stations, the physical layer of mobile radio station is carried out CRC to the data that receive and is handled.If there is not generated error, then do not transmit ACK to the base station.In this case, if the base station does not receive NACK by feedback channel, then the base station determines that all mobile radio stations normally receive data.Thus, base station data retransmission not.Because system transmits data after judgement is used for delivery time of new data, so system transmits packet regardless of feedback channel.
Fig. 5 is the flow chart that is used for receiving at the mobile radio station place method of MBMS data according to the embodiment of the invention.
With reference to figure 5, mobile radio station receives the radio resource location of relevant feedback channel and the information of scrambler in the MBMS service reception starting stage by control channel from the base station.
In step S501, mobile radio station receives the starting stage by Dedicated Control Channel MCCH reception schedule information, HARQ relevant information and the MBMS service ID C-RNTI relevant with the data transmission in the MBMS service.Mobile radio station can use the C-RNTI that transmits from the base station to receive the downlink control signal (L1/L2 control signal) that is used for MBMS.
Transmitting the method for MBMS packet from a plurality of base stations, mobile radio station receives NACK feedback probability by Dedicated Control Channel MCCH from the base station.
Mobile radio station receives the MBMS packet that transmits according to the schedule information that is transmitted that transmits by the MCCH channel in step S502.The physical layer of mobile radio station is carried out CRC to the packet that transmits from the base station and is handled in step S503.If in step S504 crc error takes place, then mobile radio station calculates the probability that transmits NACK by feedback channel based on the NACK feedback probability that transmits from the base station.Can the method that transmits the MBMS packet from a plurality of base stations, use the step of described use feedback probability.On the contrary, transmitting the method for MBMS packet, do not carrying out the step of described use feedback probability from single base station.
Transmitting the method for MBMS packet from a plurality of base stations, if reply to the feedback channel transmission according to the calculated feedback probabilistic determination, then mobile radio station confirms to be used to transmit the common feedback channel of NACK, and mobile radio station is selected one of a plurality of scramblers in step S505.Then, the scrambler that mobile radio station use to be selected comes scrambling NACK, and the NACK after the common feedback channel by base station assigns transmits scrambling in step S506.Here, the common feedback channel is the feedback channel by the common use of a plurality of mobile radio stations of base station assigns.
Transmitting the method for MBMS packet from single base station, mobile radio station uses unique scrambler of base station assigns to come the crc error check result is carried out scrambling, and by the next crc error check result after scrambling is transmitted in the base station of the dedicated feedback channel of base station assigns.
By feedback channel after NACK is transmitted in the base station, mobile radio station receives the radio resource location of the data of transmission by downlink control signal (L1/L2 control signal) in step S507.In other words, mobile radio station uses the MBMS ID of for example C-RNTI that transmits by the Dedicated Control Channel of base station reservation and distribution, the downlink control signal that MBMS distributed of decoding (L1/L2 control signal).
Mobile radio station uses the radio resource location that obtains by downlink control signal to receive the data retransmission that transmits by transmission channel in step S508, and the data retransmission that receives is carried out CRC check handle.Mobile radio station can be located to carry out the step that transmits NACK by feedback channel repeatedly according to the crc check result at the fixed time.When Dedicated Control Channel MCCH control information changed, mobile radio station was by the MCCH receiving control information.Under the situation that error does not take place, mobile radio station can transmit ACK or can not transmit ACK.
Transmitting the method for MBMS packet from a plurality of base stations, the as many feedback channel of state that receives mobile radio station with MBMS be provided, rather than provide with the sub-district in MBMS receive the as many feedback channel of number of mobile radio station.
Transmitting the method for MBMS packet, require mobile radio station to keep uplink synchronisation from single base station.Yet, transmitting the method for MBMS packet from a plurality of base stations, some mobile radio stations are not kept uplink synchronisation, because the number of mobile radio station is big.
In other words, mobile radio station can be distinguished and keep synchronous state and do not keep synchronous state.For example, in the system based on 3GPP, mobile radio station can be in RRC connection status or notconnect state.Therefore, mobile radio station must have the ability that receives the MBMS service in RRC connection status and notconnect state.In the RRC connection status, mobile radio station is assigned with the unique ID corresponding with the sub-district from the rrc layer of base station.In the RRC connection status, mobile radio station can be kept uplink synchronisation or can not keep uplink synchronisation.In the RRC notconnect state, the ID that mobile radio station is not assigned with the sub-district does not keep uplink synchronisation.
Fig. 7 is the figure that illustrates according to the feedback channel of the embodiment of the invention.
As shown in Figure 7, when sub-district A and B carried out the HARQ that is used for the MBMS packet simultaneously, base station assigns had and is used for uplink synchronisation and keeps state and uplink synchronisation and do not keep two channels of different size of state as feedback channel.
Under the situation of sub-district A and B, the feedback channel that the feedback channel that uplink synchronisation is kept the mobile radio station under the state is not kept the mobile radio station under the state than uplink synchronisation distributes earlier.In Fig. 7, Reference numeral 701 and 703 is illustrated in uplink synchronisation and keeps the feedback channel that distributes to mobile radio station under the state.Reference numeral 702 and 704 is illustrated in uplink synchronisation and does not keep the feedback channel that distributes to mobile radio station under the state.In sub-district A and B, distribute feedback channel in the different spaces in time domain and frequency domain.For example, sub-district A and B use one or two subcarrier to distribute the size of uplink feedback channel in about 1ms keeping under the state of uplink synchronisation, and under the state of not keeping uplink synchronisation in about 1ms use 1.25MHz come assignment sizes.
To the reason of distributing the different size feedback channel according to the uplink synchronization state of mobile radio station be described.Because when mobile radio station is kept when up link transmits feedback channel synchronous, mobile radio station is only to up link transmission feedback content, so feedback channel can be little.Yet, because when not keeping uplink synchronisation, must transmit synchronizing information, so the size of feedback channel is inevitable big to the base station.
With reference to figure 7, be used for feedback channel 701 that uplink synchronisation keeps the mobile radio station under the state and distribute earlier than being used for uplink synchronisation and not keeping the feedback channel 702 of the mobile radio station under the state.
In the present embodiment, provide the fixed position and the feedback channel time of downlink control signal, the power consumption that is used to save the mobile radio station under the RRC not-connected status.If because mobile radio station does not know when transmit downlink control signal, mobile radio station is decoded to downlink control signal with regard to continuing so, so mobile radio station has consumed a large amount of power.If the position of feedback channel is unfixing, then must transmit the information of relevant feedback channel position by downlink control signal.Therefore, the size of downlink control signal increases.Recently, in 3GPP LTE standard, do not define downlink control signal (L1/L2 control signal).The reason of separating feedback channel according to the state of mobile radio station is to reduce the interference volume for neighbor cell.
In the present embodiment, keep synchronous state and do not keep mobile radio station under the synchronous state when receiving simultaneously on the data generated error, allow to be in the mobile radio station transmission feedback channel of keeping synchronous state under when being in.After having received feedback channel, downlink control signal and data are transmitted in the base station, receive the data that retransmit and be in the mobile radio station of keeping state synchronously and not keeping synchronously under the state.
As shown in Figure 8, in step S801, in 10ms, keep the chance that the mobile radio station under the state distributes the transmission feedback channel to being in uplink synchronisation at the 2nd subframe place.In step S803, do not keep the chance that the mobile radio station under the state distributes the transmission feedback channel to being in uplink synchronisation at the 5th subframe place.In the present embodiment, each mobile radio station under each state distributes the chance that transmits feedback channel.Keep the mobile radio station under the state and be in the mobile radio station that uplink synchronisation do not keep under the state and receive data if be in uplink synchronisation, then be in the mobile radio station that uplink synchronisation keeps under the state and in step S801, transmit NACK to the base station by feedback channel with error.Then, these two mobile radio stations receive the downlink control signal of the 3rd subframe from the base station in step S802.Each mobile radio station confirms whether retransmitted data at the 3rd subframe place, and receives the data that retransmit.Do not keep the data that mobile radio station under the state receives re-transmission if be in uplink synchronisation, then in step S803, be not transmitted in the feedback channel that the 5th subframe place distributes.The base station can be distributed in the feedback channel that the 5th subframe place distributes, to transmit and the relevant data of unicast services (rather than MBMS).
Fig. 6 receives the flow chart of the method for MBMS data at mobile radio station according to another embodiment of the present invention in the method that transmits the MBMS data from a plurality of base stations.
With reference to figure 6, mobile radio station receives the schedule information relevant with the data transmission, HARQ relevant information and MBMS group ID C-RNTI by Dedicated Control Channel MCCH from the base station in step S601.
Mobile radio station MBMS receive the starting stage by control channel receive from the base station relevant will be by the information of the common feedback channel of the common use of mobile radio station and the scrambler that will the common feedback channel, use.Here, different common feedback channels is distributed according to the uplink synchronization state of mobile radio station in the base station.
Then, mobile radio station according to the schedule information that transmits by the MCCH channel, receives by the preferably MBMS packet of the transmission channel transmission of MCH in step S602.Mobile radio station is carried out CRC check for the MBMS data that transmit from the base station and is handled in step S603.If in step S604 crc error takes place, then mobile radio station is confirmed relevant information to the feedback channel that oneself distributes in step S605.
As mentioned above, be positioned on the time domain after the feedback channel that is in the mobile radio station distribution of keeping uplink synchronization state to the feedback channel that is in the mobile radio station distribution of not keeping uplink synchronization state.If the current feedback channel delivery time is not the time that is in the mobile radio station of not keeping uplink synchronization state, then is in the mobile radio station of not keeping uplink synchronization state and in step S607, is decoded along the downlink control signal (L1/L2 control signal) that is in the feedback channel that mobile radio station the transmitted transmission of keeping uplink synchronization state in the base station.If downlink control signal comprises the radio resource location that is used to transmit data, then mobile radio station is defined as the re-transmission of MBMS packet in step S608.Then, mobile radio station uses the radio resource location that obtains by downlink control signal in step S612, receives the data retransmission that transmits by transmission channel.
If downlink control signal does not comprise the radio resource location that is used for data retransmission in step S608, then mobile radio station is selected one of scrambler that transmits from the base station at random at step S609 in the delivery time of the feedback channel that distributes to its oneself.The scrambler that mobile radio station use to be selected comes scrambling NACK, and the NACK after the common feedback channel by base station assigns transmits scrambling in step S610.
Pass through the common feedback channel in step S 610 after NACK is transmitted in the base station at mobile radio station, mobile radio station receives the radio resource location that transmits data by downlink control signal (L1/L2 control signal) in step S611.In other words, mobile radio station uses the MBMS group ID (C-RNTI) that the base station kept and distributed to come the downlink control signal (L1/L2 control signal) of subtend MBMS distribution to decode.
Mobile radio station uses the radio resource location that obtains by downlink control signal to receive the data that retransmit by transmission channel in step S612.Then, mobile radio station is carried out the CRC check processing to the data that receive.Mobile radio station can locate to carry out repeatedly the above step that is used for transmitting to feedback channel NACK at the fixed time.And if the MCCH control information changes, then mobile radio station is by Dedicated Control Channel MCCH receiving control information.In addition, if the MBMS packet that receives does not comprise crc error in step S604, then mobile radio station can transmit ACK or can not transmit ACK.
Can be implemented as program and be stored on the computer readable recording medium storing program for performing according to said method of the present invention.Computer readable recording medium storing program for performing is that can store thereafter can be by any data storage device of the data of computer system reads.Computer readable recording medium storing program for performing comprises read-only memory (ROM), random-access memory (ram), CD-ROM, floppy disk, hard disk and magneto optical disk.
Although described the present invention at some preferred embodiment, it will be appreciated by those skilled in the art that and to carry out various changes and modification, and do not break away from the spirit and scope of the present invention that following claim limits.
Description of drawings
Fig. 1 is the block diagram that illustrates the MBMS network that the present invention is applied to.
Fig. 2 is the detailed diagram of Fig. 1.
Fig. 3 is the figure that is used for transmitting at packet-based cellular system the method for MBMS data that is used for describing according to the embodiment of the invention.
Fig. 4 is the flow chart that is used for transmitting at the place, base station the method for MBMS data according to the embodiment of the invention.
Fig. 5 is the flow chart that is used for receiving at the mobile radio station place method of MBMS data according to the embodiment of the invention.
Fig. 6 is the flow chart that is used for receiving at the mobile radio station place method of MBMS data according to another embodiment of the present invention.
Fig. 7 is the figure that illustrates according to the feedback channel of the embodiment of the invention.
Fig. 8 is used to describe according to the feedback channel distribution of the embodiment of the invention and the figure of mixed automatic retransmission request process.
Industrial applicibility
According in packet-based cellular system, transmitting and reception MBMS data of the embodiment of the invention Method by in packet-based cellular system, transmitting to a plurality of movement stations based on point-to-multipoint method Use the HARQ scheme during MBMS data, and improve the error correction efficient of receive data, simultaneously so that resource Use minimizes. And, in according to the packet-based cellular system of the embodiment of the invention, transmit and connect Receive in the method for MBMS data, the MBMS packet can be transmitted regardless of the number of movement station in the base station. So, not requiring for example complex process of following carrier hand-off process of execution, this carrier hand-off process is passed through Counting or again counting process, according to the number of movement station with processing method switch to the point-to-point method or Point-to-multipoint method.
Claims (23)
1. one kind is used for transmitting the method for multimedia broadcast multicast service (MBMS) at packet-based cellular system to a plurality of mobile radio stations, may further comprise the steps:
A) by the service groups identifier (ID) of MBMS Dedicated Control Channel to schedule information, mixed automatic retransmission request (HARQ) information and the MBMS of mobile radio station transmission data;
B) transmit the dedicated feedback channel of relevant mobile radio station and at the information of the sub-district unique scrambler different to mobile radio station with mobile radio station;
C) transmit the MBMS packet to mobile radio station;
D) if at least one from described mobile radio station receives negative really receive (NACK), then transmit the radio resource information of the data of using the downlink control signal re-transmission to mobile radio station; With
E) transmit the data that retransmitted to mobile radio station.
2. according to the process of claim 1 wherein in step d), be used this unique scrambler and scrambling and transmission by replying of dedicated feedback channel transmission.
3. according to the method for claim 2, wherein with downlink sharied signal channel (DL-SCH) as transmission channel, with information and step c) and the e of transfer step in a)) in the MBMS data.
4. according to the method for claim 2, further comprising the steps of: as, then to transmit the information of the relevant feedback channel that changes by this downlink control signal if this dedicated feedback channel changes.
5. one kind is used for transmitting the method for multimedia broadcast multicast service (MBMS) at packet-based cellular system to a plurality of mobile radio stations, may further comprise the steps:
A) pass through the service groups identifier that the MBMS Dedicated Control Channel transmits schedule information, mixed automatic retransmission request (HARQ) information and the MBMS of data;
B) transmit the common common feedback channel that uses of relevant mobile radio station and the information of at least one scrambler to mobile radio station;
C) transmit the MBMS packet to mobile radio station;
D) negate when really receiving (NACK) when from described mobile radio station at least one receives, transmit the radio resource information of using the data that downlink control signal retransmits; With
E) transmit the data that retransmitted to mobile radio station.
6. according to the method for claim 5, wherein in step a), transmit the feedback probability that the feedback channel that is used to control mobile radio station transmits probability to mobile radio station by the MBMS Dedicated Control Channel.
7. according to the method for claim 5, wherein in step d), if a plurality of scramblers are provided, then select one of described scrambler at random, the scrambler of use selecting comes scrambling NACK, and transmits NACK after the scrambling by the common feedback channel.
8. according to the method for claim 6, further comprising the steps of: detect the interference volume of common feedback channel, upgrade the feedback probability according to the interference volume that detects, and the feedback probability after mobile radio station transmits renewal.
9. method according to Claim 8, this common feedback channel of the BTS management of each sub-district wherein, and at different time and subcarrier place to this common feedback channel of each base station assigns.
10. method according to Claim 8 wherein according to the state of keeping uplink synchronisation of mobile radio station with do not keep the state of uplink synchronisation, and is differently distributed the time and the frequency location of this common feedback channel.
11. according to the method for claim 10, the common feedback channel that the common feedback channel ratio that wherein is in the mobile radio station under the state of keeping uplink synchronisation is in the mobile radio station under the state of not keeping uplink synchronisation is assigned with earlier on time domain.
12. according to any the method in claim 2 and 8, wherein within the scheduled time after receiving NACK, use the preset frequency space, come to transmit downlink control signal to mobile radio station.
13. a method that is used for receiving at packet-based cellular system multimedia broadcast multicast service (MBMS) data that transmit to a plurality of mobile radio stations may further comprise the steps:
A) receive schedule information, mixed automatic retransmission request (HARQ) relevant information and the group identifier that transmits data by the MBMS Dedicated Control Channel;
B) receive the feedback channel of relevant each mobile radio station distribution and at the information of sub-district unique scrambler different with mobile radio station;
C) receive the MBMS data;
D) transmit the crc error check result of the MBMS data that are used to receive by this dedicated feedback channel;
E) radio resource location of the data that receive to retransmit by downlink control signal; With
F) receive the data that retransmitted.
14. according to the method for claim 13, wherein in step d), this crc error check result is used this unique scrambler and scrambling, and transmits by this dedicated feedback channel.
15. according to the method for claim 14, wherein with downlink sharied signal channel (DL-SCH) as transmission channel, with information and step c) and the f of receiving step in a)) in the MBMS data.
16. it is, further comprising the steps of: as when this dedicated feedback channel changes, to receive the information of the relevant feedback channel that changes by this downlink control signal according to the method for claim 14.
17. a method that is used for receiving at packet-based cellular system multimedia broadcast multicast service (MBMS) data that transmit to a plurality of mobile radio stations may further comprise the steps:
A) by the service groups identifier of MBMS Dedicated Control Channel reception by schedule information, mixed automatic retransmission request (HARQ) relevant information and the MBMS of the transmission data of MBMS Dedicated Control Channel;
B) receive the common common feedback channel that uses of relevant mobile radio station and the information of at least one scrambler;
C) receive the MBMS packet;
D) transmit the crc error check result of the MBMS data that are used to receive by this common feedback channel;
E) receive the radio resource location that transmits data by downlink control signal; With
F) receive the data that retransmitted.
18., wherein in step a), receive the feedback probability that the feedback channel that is used to control mobile radio station transmits probability by the MBMS Dedicated Control Channel according to the method for claim 17.
19. method according to claim 17, wherein in step d),, then select one of described scrambler at random if a plurality of scramblers are provided, the scrambler of use selecting comes this crc error check result of scrambling, and transmits crc error check result after the scrambling by the common feedback channel.
20., wherein within the scheduled time after having transmitted the crc error check result, receive this downlink control signal by the preset frequency space according to the method for claim 19.
21. according to the method for claim 19, if wherein generated crc error, then transmitting by this common feedback channel negates really to receive (NACK).
22. a method that is used for receiving at packet-based cellular system multimedia broadcast multicast service (MBMS) data that transmit to a plurality of mobile radio stations may further comprise the steps:
A) pass through the service groups identifier that the MBMS Dedicated Control Channel receives the schedule information, mixed automatic retransmission request (HARQ) relevant information and the MBMS that transmit data;
B) receive the common common feedback channel that uses of relevant mobile radio station and the information of at least one scrambler;
C) receive the MBMS packet;
D) if the MBMS data that receive have crc error, then confirm the information of the feedback channel of relevant base station assigns;
E) the decoding downlink control signal and does not transmit the crc error check result, and if the data retransmission in the downlink control signal of radio resource location and decoding relevant, then receive this data retransmission;
F) transmit the crc error check result of the MBMS data that received by this common feedback channel;
G) receive the radio resource location of data retransmission by downlink control signal; With
H) receive this data retransmission.
23. method according to claim 22, wherein in step d),, then select one of described scrambler at random if a plurality of scramblers are provided, the scrambler of use selecting comes this crc error check result of scrambling, and transmits crc error check result after the scrambling by the common feedback channel.
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| KR20060079785 | 2006-08-23 | ||
| KR1020060079785 | 2006-08-23 | ||
| KR1020060086121 | 2006-09-07 | ||
| KR1020060094657 | 2006-09-28 |
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| CN101529783A true CN101529783A (en) | 2009-09-09 |
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| CNA2007800395131A Pending CN101529783A (en) | 2006-08-23 | 2007-08-23 | Mbms data transmission and receiving in packet based on cellular system |
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| CN107734606A (en) * | 2016-08-12 | 2018-02-23 | 中兴通讯股份有限公司 | The transmission method and device of a kind of multicast service |
| CN110168985B (en) * | 2017-01-08 | 2022-08-09 | 株式会社Ntt都科摩 | Transmission method, base station and mobile station used in uplink hybrid automatic repeat request (HARQ) |
| CN110168985A (en) * | 2017-01-08 | 2019-08-23 | 株式会社Ntt都科摩 | Transmission method, base station and mobile station used in uplink mixed automatic retransfer (HARQ) |
| CN114930750A (en) * | 2020-01-10 | 2022-08-19 | 高通股份有限公司 | Mixed mode broadcast/multicast communications |
| US11984995B2 (en) | 2020-01-10 | 2024-05-14 | Qualcomm Incorporated | Mixed mode broadcast/multicast communication |
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