CN101127748A - Transmission method and device for uplink synchronization command word in OFDM mobile communication system - Google Patents
Transmission method and device for uplink synchronization command word in OFDM mobile communication system Download PDFInfo
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Abstract
The utility model discloses a transmission way for uplink synchronization command words in OFDM mobile communication system, which is characterized in that uplink synchronization command words (SC) are sent to UE together with special dispatching information or packaged in protocol data units (PDU) and sent to UE to provide convenience for a receiver to conduct fast demodulation and timing adjustment. Transmission of uplink synchronization command words (SC) with special dispatching information to UE can meet the necessity of frequent adjustment of uplink synchronization in the network. In case of occasions that frequent adjustment of uplink synchronization is not needed, uplink synchronization codes (SC) are packaged in protocol data units (PDU) and sent to UE, which saves network resources and reduces signaling spending. The utility model also discloses a processing device and user device for synchronization command words (SC).
Description
Technical field
The present invention relates to the communications field, relate in particular to the sending method and the device of uplink synchronous command word in the OFDM mobile communication system.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing, Orthodoxy Frequency Division Multiplex) is MCM (Multicarrier Modulation, multi-carrier modulation) a kind of, can be overlapped between its each subcarrier, and can keep orthogonality between each subcarrier, compare with traditional multi-carrier modulation and have the higher availability of frequency spectrum.In the OFDM mobile communication system, be the lower sub data flow of N road speed with the data flow serial to parallel conversion, remove to modulate parallel transmission behind the N way carrier wave respectively with them.Because the speed of sub data flow is original 1/N, be that symbol period is expanded as original N doubly, maximum delay spread much larger than channel, so just a wideband frequency selective channel is divided into N arrowband flat fading channel, thereby have the very strong anti-wireless channel multipath fading and the ability of anti-impulse disturbances, be particularly suitable for the high speed wireless data transmission.Because OFDM has the characteristic of excellence like this, therefore present 3GPP (3th GenerationPartner Project, third generation partnership projects) in LTE (1ong term evolution, the Long Term Evolution) scheme discuss, OFDM has been defined as basic access mode.
In the OFDM mobile communication system, because UE (User Equipment, subscriber equipment) constantly moves, constantly change with the distance of base station, therefore the upward signal of each UE transmission may not can arrive the base station simultaneously, may bring ISI (Inter-Symbol Interference, intersymbol interference) and ICI (Inter-Carrier Interference like this, inter-carrier interference), reduce the demodulation performance of system.In order to address this problem, prior art generally when initial the access, adopts open loop approach to carry out the timing adjustment that UE sends, and promptly UE obtains to send the timing adjustment information of data by random access procedure; In link maintenance process, generally carry out the timing adjustment that UE sends by closed-loop fashion, network side is according to the signal that receives the UE transmission is measured, judge whether UE needs to adjust, and pass through SC (synchronization Control, synch command word) notice UE and adjust accordingly.But for how to send synch command to subscriber equipment, industry does not also have concrete technical scheme at present.
Summary of the invention
Network side the invention provides the sending method and the device of uplink synchronous command word in a kind of OFDM mobile communication system, so that can be handed down to subscriber equipment with the synch command word.
The invention provides following technical scheme:
The sending method of uplink synchronous command word in a kind of OFDM mobile communication system, the method comprising the steps of:
Network side produces uplink synchronous command word (SC) according to the upstream data of the subscriber equipment that receives;
Network side carries out the specific schedule information in described SC and the scheduling control signaling of downlink multiplexing, and is mapped on the OFDM symbol and sends to subscriber equipment;
Described subscriber equipment demultiplexing from the OFDM symbol that receives goes out described SC.
According to said method:
Network side is by send the OFDM symbol that carries SC certain dispatching cycle to subscriber equipment.
Described SC all is mapped on the same sub-carrier in the OFDM symbol at every turn.
Described SC is mapped on the middle subcarrier of the shared Physical Resource Block of specific schedule information.
If described specific schedule information takies a plurality of Physical Resource Block of OFDM symbol, then described SC is mapped on the middle subcarrier of first Physical Resource Block.
Described SC and the separate coding of described specific schedule information; Perhaps, described SC and described specific schedule information combined coding.
Described SC adopts the variable step control mode to carry out the uplink synchronous adjustment with indication subscriber equipment (UE) by different step-lengths; Perhaps, described SC adopts the fixed step size control mode to carry out the uplink synchronous adjustment with indication UE by identical step-length.
When described SC and described specific schedule information combined coding, described SC adopts identical modulation system with described specific schedule information; Perhaps, when described SC and the separate coding of described specific schedule information, described SC can adopt identical modulation system with described specific schedule information, also can adopt different modulation systems.
This method also comprises step:
Described subscriber equipment carries out the uplink synchronous adjustment according to the SC that demultiplexing goes out.
The sending method of uplink synchronous command word in a kind of OFDM mobile communication system, the method comprising the steps of:
Network side produces uplink synchronous command word SC according to the upstream data of the subscriber equipment that receives;
Network side is encapsulated in described SC in control PDU (Protocol Data Unit, protocol Data Unit), and is mapped on the OFDM symbol and sends to subscriber equipment;
Described subscriber equipment deblocking from the control protocol data cell PDU that receives takes on SC.
According to said method:
Network side is encapsulated in described SC among the control protocol data cell PDU at MAC (Media Access Control, medium access control system) layer, and carries corresponding indication information in the MAC head; Perhaps, network side is encapsulated in described SC among the control protocol data cell PDU, and carries corresponding indication information in the RLC head at RLC (Radio Link Control, Radio Link control) layer.
Network side directly generates a transmission block with described control PDU at the MAC layer, is mapped on the OFDM symbol; Perhaps, network side MAC layer is multiplexed into a transmission block with described control PDU and data PDU, is mapped on the OFDM symbol.
Described SC adopts the variable step control mode to carry out the uplink synchronous adjustment with indication UE by different step-lengths; Perhaps, described SC adopts the fixed step size control mode to carry out the uplink synchronous adjustment with indication UE by identical step-length.
This method also comprises step:
Described subscriber equipment carries out the uplink synchronous adjustment according to the SC that deblocking takes on.
The processing unit of a kind of synch command word SC comprises:
Coding unit is used for the specific schedule information of SC and scheduling control signaling of downlink is encoded;
Modulating unit is used for SC and specific schedule information behind the coding are modulated;
Multiplexing Unit is used for SC and specific schedule information after the multiplexing modulation;
Map unit is used for the SC after multiplexing and specific schedule information mapping to the OFDM symbol;
Transmitting element is used to send described OFDM symbol.
Wherein, described transmitting element is by send the OFDM symbol that carries SC certain dispatching cycle to subscriber equipment.
Described map unit is mapped to SC on the same sub-carrier in the OFDM symbol at every turn.
Described map unit is mapped to SC on the middle subcarrier of the shared Physical Resource Block of specific schedule information.
The processing unit of a kind of synch command word SC comprises:
Encapsulation unit is used for synch command word SC is encapsulated in control protocol data cell PDU;
Coding unit is used for described control PDU is encoded;
Modulating unit is used for the control PDU behind the coding is modulated;
Map unit is used for the control PDU after the modulation is mapped to the OFDM symbol;
Transmitting element is used to send described OFDM symbol.
Wherein, described encapsulation unit is positioned at network side medium access control system MAC layer or network side radio controlling links rlc layer.
Described encapsulation unit directly generates a transmission block with described control PDU, is mapped on the OFDM symbol; Perhaps, described encapsulation unit is multiplexed into a transmission block with described control PDU and data PDU, is mapped on the OFDM symbol.
Described SC adopts the variable step control mode to carry out the uplink synchronous adjustment with indication UE by different step-lengths; Perhaps, described SC adopts the fixed step size control mode to carry out the uplink synchronous adjustment with indication UE by identical step-length.
A kind of subscriber equipment comprises:
Receiving element is used to receive the OFDM symbol;
Demultiplexing unit is used for the specific schedule information that accesses from described OFDM symbolic solution and the multiplexed information demultiplexing of SC and goes out SC and specific schedule information;
Demodulating unit is used for the SC behind the demultiplexing is carried out demodulation;
Decoding unit is used for the SC after the demodulation is decoded;
Adjustment unit is used for carrying out the uplink synchronous adjustment according to this SC synchronously.
A kind of subscriber equipment comprises:
Receiving element is used to receive the OFDM symbol;
Demodulating unit is used for the OFDM symbol that receives is carried out demodulation;
Decoding unit is used for the OFDM symbol after the demodulation is decoded, and obtains control corresponding PDU;
Decapsulation unit is used for taking on SC from described control PDU deblocking;
Adjustment unit is used for carrying out the uplink synchronous adjustment according to this SC synchronously.
Beneficial effect of the present invention is as follows:
1, the present invention sends to UE with uplink synchronous command word SC with specific schedule information, perhaps uplink synchronous command word SC is encapsulated in the control protocol data cell PDU and sends to UE, can make things convenient for the receiver fast demodulation and carry out timing adjustment.
2, uplink synchronous command word SC is sent to UE with specific schedule information, can satisfy the needs that needs in the network are frequently adjusted uplink synchronous; To not needing frequently to adjust the situation of uplink synchronous, uplink synchronous command word SC is encapsulated in the control protocol data cell PDU sends to UE, help saving Internet resources, reduce signaling consumption.
Description of drawings
Fig. 1 is the structural representation of communication system in the example one of the present invention;
Fig. 2 is the structural representation of synch command word SC processing unit in the example one of the present invention;
Fig. 3 is the structural representation of subscriber equipment in the example one of the present invention;
Fig. 4 is the frame structure schematic diagram of LTE system fdd mode in the example one of the present invention;
Fig. 5 is the frame structure schematic diagram of LTE system TDD mode in the example one of the present invention;
Fig. 6 is SC in the example one of the present invention and specific schedule information multiplexing and mapping schematic diagram;
Fig. 7 is the process chart of synch command word in the example one of the present invention;
Fig. 8 is network side system structural representation in the example two of the present invention;
The PDU form schematic diagram that Fig. 9 adopts for LTE system in the example two of the present invention;
Figure 10 is the structural representation of synch command word SC processing unit in the example two of the present invention;
Figure 11 is the structural representation of subscriber equipment in the example two of the present invention;
Figure 12 handles the flow chart of synch command word for network side in the example two of the present invention;
Figure 13 handles the flow chart of synch command word for user equipment (UE) side in the example two of the present invention.
Embodiment
In order to make network side synch command word SC can be handed down to user equipment (UE), the present invention sends to UE with uplink synchronous command word SC with specific schedule information, perhaps uplink synchronous command word SC is encapsulated in the control protocol data cell PDU and sends to UE; UE obtains to carry out the uplink synchronous adjustment behind the SC.
Embodiment one
Present embodiment is with multiplexing uplink synchronous command word SC and downlink dedicated schedule information and to send it to UE be that example describes.
Consult shown in Figure 1, a kind of communication system in this example comprises: comprise eNB (E-UTRANNodeB, base station after the evolution) 100 and user equipment (UE) 101, wherein form an E-UTRAN (Evolved Universal Terrestrial Radio Access Network, the universal land radio access web after the evolution) at one of network side and a plurality of base station eNB; Described base station eNB 100 is used to produce uplink synchronous command word SC, and itself and specific schedule information are carried out multiple week, and with the SC after multiplexing and specific schedule information mapping in the OFDM symbol on the corresponding Physical Resource Block and send to user equipment (UE) 101; Described user equipment (UE) 101 is used for carrying out up transmission according to described SC and adjusts synchronously.
Consult shown in Figure 2ly, the processing unit of a kind of synch command word SC in the present embodiment comprises: coding unit 200, modulating unit 201, Multiplexing Unit 202, map unit 203, transmitting element 204; Described coding unit 200 is used for the specific schedule information of SC and scheduling control signaling of downlink is encoded; Described modulating unit 201 is used for SC and specific schedule information behind the coding are modulated; Described Multiplexing Unit 202 is used for SC and specific schedule information after the multiplexing modulation; Described map unit 203 is used for the SC after multiplexing and specific schedule information mapping to the OFDM symbol; Described transmitting element 204 is used to send described OFDM symbol.
Described OFDM symbol can all send by sending to subscriber equipment certain dispatching cycle in each cycle, also can send at interval several cycles.
Consult shown in Figure 3ly, a kind of subscriber equipment in the present embodiment comprises: receiving element 300, demultiplexing unit 301, demodulating unit 302, decoding unit 303, adjustment unit 304 synchronously; Described receiving element 300 is used to receive the OFDM symbol; Described demultiplexing unit 301 is used for the specific schedule information that accesses from described OFDM symbolic solution and the multiplexed information demultiplexing of SC and goes out SC and specific schedule information; Described demodulating unit 302 is used for the SC behind the demultiplexing is carried out demodulation; Described decoding unit 303 is used for the SC after the demodulation is decoded; Described synchronous adjustment unit 304 is used for carrying out the uplink synchronous adjustment according to this SC.
Described subscriber equipment also comprises transmitting element of the prior art, be used for to the data that up needs send encode, multiplexing and modulation back sends, do not mark among the figure.
Described specific schedule information is subordinated to the scheduling control signaling that defines among the present LTE.Consult shown in the table 1, the scheduling control signaling that defines among the LTE is divided three classes and sends respectively at present, and wherein type I information obtains before the UE downlink data receiving in advance, comprises the effective time of UE ID, resource assignment mode, signaling piece etc.UE extracts this user data from the corresponding downstream Resource Block after obtaining this type I information, because each UE of this category information will receive, be referred to as public schedule information in the present embodiment; Second class and the 3rd category information are after UE receives type I information, judge whether that according to type I information needs receive, because this two category information is not that each UE will receive, be referred to as specific schedule information in the present embodiment, can adopt figuration (is that velocity of wave is shaped, the signal energy that sends to the user concentrated in the narrower velocity of wave reducing disturbs, improve user received signal intensity) mode send.
Table 1: scheduling control signaling
| Field | Position long (bit) | Remarks | ||
| The first kind (resource allocation) | The user indicates (pressing UE or particular group divides) | 9 | Indication needs to receive a UE or one group of UE of data | |
| Resource allocation | 24 | Indication UE (s) needs (void) Resource Unit (equivalent layer when transmitting with the indication multilayer) of demodulation | ||
| The resource continuous time | 3 | The duration of the resource of this sub-distribution, can be used for the control transmission time interval or continuous dispatching | ||
| Second class (transformat) | Many aerial informations | 2 | Particular content depends on that many antennas are to adopt the multiplexing scheme of multiple-input and multiple-output (MIMO) or the scheme of wave beam forming | |
| Modulation system | 2 | Comprise QPSK, 16QAM, 64QAM when multilayer is transmitted, may need a plurality of examples | ||
| The payload size | 6 | Depend on the modulation system of employing and the number of resources of distribution.When multilayer is transmitted, may need a plurality of examples | ||
| The 3rd class (mixing automatic repeat requests) | Adopt the automatic repeat requests mode of asynchronous mixing | The hybrid automatic repeat request process number | 3 | Indicate hybrid automatic repeat request process that current transmission adopts number |
| Redundancy versions | 2 | Be used to support incremental redundancy | ||
| The new data indication | 1 | Being used for soft buffer memory empties | ||
| Re-transmission sequence number | 2 | Be derived from redundancy versions (so that supporting incremental redundancy) and new data indication (being used to handle soft buffer memory empties) | ||
Consult shown in Figure 4ly, at present in the LTE system in the frame structure of fdd mode, the radio frames of a 10ms is divided into the subframe of 20 0.5ms, and each subframe comprises 7 OFDM symbols.Consult shown in Figure 5, at present in the LTE system in the frame structure of tdd mode, the radio frames of a 10ms is divided into two duplicate 5ms subframes, and each subframe comprises 7 regular traffic time slots and 3 special time slots, and wherein each regular traffic time slot comprises 9 OFDM symbols.Data to be sent are after process is encoded, interweaves and modulated, when being mapped to OFDM/frequency symbol on, described symbol is made up of one or more PRB (Physical ResourceBlock, Physical Resource Block), and one of them PRB is made up of M continuous sub-carriers in a plurality of continuous OFDM symbols.The Physical Resource Block number that comprises under the different bandwidth when consulting table 2 and being depicted as M=25.
PRB number under different bandwidth during table 2:M=25
| Channel width (MHz) | 1.25 | 2.5 | 5.0 | 10.0 | 15.0 | 20.0 |
| Physical Resource Block bandwidth (kHz) | 375 | 375 | 375 | 375 | 375 | 375 |
| Available Physical Resource Block number | 3 | 6 | 12 | 24 | 36 | 48 |
Preferable, UE receiving demodulation synch command word SC carries out the timing adjustment of up transmission for convenience, the fixed-site of SC in OFDM time/frequency symbol, and promptly described SC all is mapped on the same sub-carrier in the OFDM symbol at every turn.
Further, described SC is mapped on the middle subcarrier of the shared Physical Resource Block of specific schedule information.The sub-carrier number that supposing the system is distributed to specific schedule information be N (subcarrier number is 0,1,2 ..., N-1, N), SC needs to take m subcarrier after modulation, the subcarrier number of then carrying SC is:
Num＝floor((N-m)/2)±i.........................[1]
I=0 wherein, 1 ..., m-1, wherein, floor (x) expression rounds downwards, promptly gets less than x and approaches the integer of x most, as floor (3.7)=3.
Further, if the downlink dedicated schedule information has taken a plurality of PRB, then SC is by the carrying of the subcarrier in the middle of first PRB.At present in the LTE system, resource allocation has dual mode, be localized (centralized) and distributed (distributed) mode, no matter adopt which kind of method of salary distribution, SC all takies the subcarrier in the middle of first PRB, concrete subcarrier number can adopt the method in the formula 1 to calculate, and need be numbered the subcarrier unification of PRB inside during calculating.
Preferable, the subscriber equipment fast decoding goes out SC for convenience, and described SC bit adopts absolute coding, and as adopting repeated encoding, repetition factor is N (N is the positive integer less than 4), during as N=1, is 00,01,11,10 behind the SC bit repeated encoding; During N=2, be 0000,0101,1111,1010 behind the SC bit repeated encoding.SC described here also can with specific schedule information combined coding.
In present LTE system, when descending scheduling variable period at UE, promptly might dispatch UE continuously, also might be every a lot of frame scheduling UE, network side is according to the position difference of the upward signal that receives, wish the each step-length difference of adjusting of UE, this moment, the SC symbol adopted variable step control mode as shown in table 3, and different SC bit values is corresponding to the adjustment of different step-lengths.Here SC takies 2 bits, and the step-length in the table can the unit of being sampled as, and equals 1 sampling as a step-length, and k determines that according to emulation and actual measurement the suggestion span is (1/2,1,2).
Table 3: the SC symbol of variable step control
| The SC symbol | Implication |
| 00 | Adjust k/4 step-length forward |
| 10 | Adjust k step-length forward |
| 11 | Adjust k/4 step-length backward |
| 01 | Adjust k step-length backward |
Further, fix, as VOIP (Voice OverIP when the descending scheduling cycle at UE, IP-based voice transfer) business, this moment, the SC symbol adopted fixed step size control mode as shown in table 4, and SC takies 1 bit, k is desirable 1/4, transfers or transfer backward at every turn 1/4 step-length forward.
Table 4: the SC symbol of fixed step size control
| The SC symbol | Meaning |
| 0 | Adjust k step-length forward |
| 1 | Adjust k step-length backward |
When described SC and described specific schedule information combined coding, described SC adopts identical modulation system with described specific schedule information; When described SC and the separate coding of described specific schedule information, described SC can adopt identical modulation system with described specific schedule information, also can adopt different modulation systems, as the BPSK modulation, takies two sub-carriers carry.Preferable, the subscriber equipment fast demodulation goes out SC for convenience, and described SC adopts the modulation system different with specific schedule information.
Specific schedule information finish coding, modulation and multiplexing after, carry out multiplexingly with SC after coding and the BPSK modulation, be mapped on the subcarrier.Consult and Figure 6 shows that SC and specific schedule information carries out a concrete example multiplexing and mapping, take 50 subcarriers in the OFDM symbol altogether after multiplexing and the mapping.UE is after receiving this OFDM symbol, and directly the 24th, 25 two subcarriers of demodulation can obtain SC, thereby sends regularly adjustment according to this SC.
In present LTE system, all users share physical resource, unified scheduling of network side and distribution physical resource.Network side is before certain UE sends data, and elder generation sends scheduling control signaling, thereby information such as Physical Resource Block (subcarrier), coding and modulation system, the data block size notice UE of carrying data, so that UE receives, separates mediation decoding.After UE handled the data that receive, whether correct feedback information such as, channel quality indication data decoding gave network side, carries out follow-up data with the auxiliary network side and send.In the specific schedule information of network side in sending scheduling control signaling, send the SC that is used to control the up timing adjustment of UE, UE carries out up transmission according to this SC and regularly adjusts after receiving described SC.
Consulting shown in Figure 7ly, is example with system configuration shown in Figure 1, and the handling process of synch command word is as follows:
SC after step 703, network side will encode and modulate and encoded, modulation and multiplexing after specific schedule information carry out multiplexing.
In the OFDM symbol on the corresponding Physical Resource Block and send to UE, this SC is fixed on the subcarrier in the middle of the Physical Resource Block with the SC after multiplexing and specific schedule information mapping for step 704, network side.
Method in the present embodiment one is particularly useful for needing in the network frequently to adjust the situation of uplink synchronous.
Embodiment two
Present embodiment is that example describes so that uplink synchronous command word SC is sent to UE in medium access control system MAC layer is encapsulated in control protocol data cell PDU.
Consult shown in Figure 8, network side system in the present embodiment comprises physical layer and MAC layer two parts, wherein, physical layer comprises: public control module 800, up reception, demodulation and measurement module 801, down channel mapping, modulation and transmission module 802 and channel decoding processing module 803.
Described public control module 800 is used to finish the physical layer part signaling and distributes, and the resource of physical layer is managed and controls; Described up reception, demodulation and measurement module 801 are used to finish uplink channel estimation, Data Detection, separate and be in harmonious proportion the signal that butt joint receives and measure, to carry out processing such as uplink synchronous control; Described down channel mapping, modulation and sending module 802 are used to receive the data that described channel decoding processing module 803 is handled, and modulate, channel Mapping and transmission; Described channel decoding processing module 803, be used for receiving the transmission block that the MAC layer sends at down direction, encode, interweave, processing such as rate-matched, up direction receives the demodulating data that up reception, demodulation and measurement module send, data are separated rate-matched, deinterleaving and decoding handle, and decode results is sent to the MAC layer.
The MAC layer comprises: scheduling and control module 804, data multiplex and transmission block generation module 805, mix automatic repeat requests (HARQ, Hybrid Automatic Repeat reQuest) module 806; Described scheduling and control module 804 are used to finish scheduling and resource allocation between the inner different priorities data of the relevant parameter configuration of MAC layer, UE and UE; Described data multiplex and transmission block generation module 805 are used for according to the scheduling and the control signaling of control module, one or more SDU (Service DataUnit that high level is come, Service Data Unit) carry out multiplexing, add the MAC header, and generate transmission block, send to physical layer process; The automatic repeat requests HARQ module 806 of described mixing is used to finish the HARQ function, adopts the multi-process stop-and-wait protocol, and a plurality of processes of UE are managed, and assists scheduling and control module to finish fast dispatch and data re-transmission.
Consult a concrete example of the PDU form that Figure 9 shows that a kind of present LTE system adopts, the meaning of each field representative is as follows:
DDI (Data description indicator, the data description designator): DDI length of field 5 bits, " 11111 " are special value DDI0, promptly be expressed as MAC control PDU, when DDI is designated as control PDU, then after this DDI field, also comprise a field CT, the type of the content that comprises among the indication control PDU.00000～11110 presentation logic channel number is disposed by high level.
LI (Length indicator, Length Indication): LI length of field 10 bits, the length of indication MAC SDU, unit is a byte.
F1 length of field 1 bit, whether the indication back also has LI and F1 territory; When being 0, expression does not have, and 1 expression has.
F2 length of field 1 bit, whether the indication back also has DDI; When being 0, expression does not have, and 1 expression has.
The CT territory is 2 bits, and the content that comprises among the 00 expression control PDU is for regularly adjusting command word SC; The content that comprises among the 01 expression control PDU is that network side is the scheduling resource indication of UE distribution or the dispatch request that UE sends to network side; The content that comprises among the 10 expression control PDU is the paging information of network side layer 2; 11 keep, and can indicate the control signaling of other layers 2.
MAC payload is the content of actual transmissions partly, comprises MAC SDU or MAC control PDU, in order to make the size of whole M AC PDU adapted transmission piece, may also have some filling bits.
After the subscriber equipment physical layer is received the data of network side transmission, decipher processing, transport block data after the decoding is sent to subscriber equipment MAC layer, after subscriber equipment MAC layer is received transport block data, extract the MAC head, judge whether that control PDU and the transmission content for the MAC layer is the SC command word, if, then extract the PDU content, and the SC command word of extracting is sent to the subscriber equipment physical layer by inside story.
Consult shown in Figure 10ly, the processing unit of a kind of synch command word SC in the present embodiment comprises: encapsulation unit 1000, coding unit 1001, modulating unit 1002, map unit 1003, transmitting element 1004; Described encapsulation unit 1000 is used for described SC is encapsulated in control protocol data cell PDU; Described coding unit 1001 is used for described control PDU is encoded; Described modulating unit 1002 is used for the control PDU behind the coding is modulated; Described map unit 1003 is used for the control PDU after the modulation is mapped to the OFDM symbol; Described transmitting element 1004, the data that are used for comprising described control PDU send to subscriber equipment.
Described encapsulation unit 1000 is arranged in the multiplexing and transmission block generation module 805 of MAC layer data; Described coding unit 1001, modulating unit 1002, map unit 1003, transmitting element 1004 are arranged in physical layer descending channel Mapping, modulation and sending module 802.
Consult shown in Figure 11ly, a kind of subscriber equipment in the present embodiment comprises receiving element 1100, demodulating unit 1101, decoding unit 1102, decapsulation unit 1103, adjustment unit 1104 synchronously; Described receiving element 1100 is used to receive the OFDM symbol; Described demodulating unit 1101 is used for the OFDM symbol that receives is carried out demodulation; Described decoding unit 1102 is used for the OFDM symbol after the demodulation is decoded, and obtains control corresponding PDU; Described decapsulation unit 1103 is used for taking on SC from described control PDU deblocking; Described synchronous adjustment unit 1104 is used for carrying out the uplink synchronous adjustment according to this SC.Described subscriber equipment also comprises transmitting element of the prior art, be used for to the data that up needs send encode, multiplexing and modulation back sends, do not mark among the figure.
Consulting shown in Figure 12ly, is example with system configuration shown in Figure 8, and the flow process that network side is handled the synch command word is as follows:
Consulting shown in Figure 13ly, is example with system configuration shown in Figure 8, and the flow process that the user equipment (UE) side is handled the synch command word is as follows:
Step 1300, UE physical layer detect and receive the downlink data that network side sends;
Step 1301, UE physical layer are carried out processing such as demodulation, decoding to downlink data, and will decipher the MAC layer that correct data send to UE;
The MAC of step 1302, UE handles the data that receive, and judges if what comprise among control PDU and the control PDU is that command word SC is adjusted in up timing, then this SC is extracted and sends to the UE physical layer;
Step 1303, UE physical layer are adjusted according to this SC when sending upstream data next time synchronously.
Method in the present embodiment two is particularly useful for not needing frequently to adjust in the network situation of uplink synchronous, and this method can be saved the overhead bit of physical channel.
From the foregoing description as can be known, the present invention sends to UE with uplink synchronous command word SC with specific schedule information, perhaps uplink synchronous command word SC is encapsulated in the control protocol data cell PDU and sends to UE, can make things convenient for the receiver fast demodulation and carry out timing adjustment; SC sends to UE with specific schedule information with the uplink synchronous command word, can satisfy the needs that needs in the network are frequently adjusted uplink synchronous; To not needing frequently to adjust the situation of uplink synchronous, uplink synchronous command word SC is encapsulated in the control protocol data cell PDU sends to UE, help saving Internet resources, reduce signaling consumption.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (24)
1. the sending method of uplink synchronous command word in the OFDM mobile communication system is characterized in that the method comprising the steps of:
Network side produces uplink synchronous command word (SC) according to the upstream data of the subscriber equipment that receives;
Network side carries out the specific schedule information in described SC and the scheduling control signaling of downlink multiplexing, and is mapped on the OFDM symbol and sends to subscriber equipment;
Described subscriber equipment demultiplexing from the OFDM symbol that receives goes out described SC.
2. the method for claim 1 is characterized in that, network side is by send the OFDM symbol that carries SC certain dispatching cycle to subscriber equipment.
3. the method for claim 1 is characterized in that, described SC all is mapped on the same sub-carrier in the OFDM symbol at every turn.
4. method as claimed in claim 3 is characterized in that, described SC is mapped on the middle subcarrier of the shared Physical Resource Block of specific schedule information.
5. method as claimed in claim 4 is characterized in that, if described specific schedule information takies a plurality of Physical Resource Block of OFDM symbol, then described SC is mapped on the middle subcarrier of first Physical Resource Block.
6. as each described method of claim 1 to 5, it is characterized in that described SC and the separate coding of described specific schedule information; Perhaps, described SC and described specific schedule information combined coding.
7. method as claimed in claim 6 is characterized in that, described SC adopts the variable step control mode to carry out the uplink synchronous adjustment with indication subscriber equipment (UE) by different step-lengths; Perhaps, described SC adopts the fixed step size control mode to carry out the uplink synchronous adjustment with indication UE by identical step-length.
8. method as claimed in claim 6 is characterized in that, when described SC and described specific schedule information combined coding, described SC adopts identical modulation system with described specific schedule information; Perhaps, when described SC and the separate coding of described specific schedule information, described SC can adopt identical modulation system with described specific schedule information, also can adopt different modulation systems.
9. the method for claim 1 is characterized in that, this method also comprises step:
Described subscriber equipment carries out the uplink synchronous adjustment according to the SC that demultiplexing goes out.
10. the sending method of uplink synchronous command word in the OFDM mobile communication system is characterized in that the method comprising the steps of:
Network side produces uplink synchronous command word SC according to the upstream data of the subscriber equipment that receives;
Network side is encapsulated in described SC among the control protocol data cell PDU, and is mapped on the OFDM symbol and sends to subscriber equipment;
Described subscriber equipment deblocking from the control protocol data cell PDU that receives takes on SC.
11. method as claimed in claim 10 is characterized in that, network side is encapsulated in described SC among the control protocol data cell PDU at medium access control system MAC layer, and carries corresponding indication information in the MAC head; Perhaps, network side is encapsulated in described SC among the control protocol data cell PDU at Radio Link control rlc layer, and carries corresponding indication information in the RLC head.
12. method as claimed in claim 11 is characterized in that, network side directly generates a transmission block with described control PDU at the MAC layer, is mapped on the OFDM symbol; Perhaps, network side MAC layer is multiplexed into a transmission block with described control PDU and data PDU, is mapped on the OFDM symbol.
13., it is characterized in that described SC adopts the variable step control mode to carry out the uplink synchronous adjustment with indication UE by different step-lengths as claim 10,11 or 12 described methods; Perhaps, described SC adopts the fixed step size control mode to carry out the uplink synchronous adjustment with indication UE by identical step-length.
14. method as claimed in claim 13 is characterized in that, this method also comprises step:
Described subscriber equipment carries out the uplink synchronous adjustment according to the SC that deblocking takes on.
15. the processing unit of a synch command word SC is characterized in that, comprising:
Coding unit is used for the specific schedule information of SC and scheduling control signaling of downlink is encoded;
Modulating unit is used for SC and specific schedule information behind the coding are modulated;
Multiplexing Unit is used for SC and specific schedule information after the multiplexing modulation;
Map unit is used for the SC after multiplexing and specific schedule information mapping to the OFDM symbol;
Transmitting element is used to send described OFDM symbol.
16. device as claimed in claim 15 is characterized in that, described transmitting element is by send the OFDM symbol that carries SC certain dispatching cycle to subscriber equipment.
17. device as claimed in claim 15 is characterized in that, described map unit is mapped to SC on the same sub-carrier in the OFDM symbol at every turn.
18. device as claimed in claim 17 is characterized in that, described map unit is mapped to SC on the middle subcarrier of the shared Physical Resource Block of specific schedule information.
19. the processing unit of a synch command word SC is characterized in that, comprising:
Encapsulation unit is used for synch command word SC is encapsulated in control protocol data cell PDU;
Coding unit is used for described control PDU is encoded;
Modulating unit is used for the control PDU behind the coding is modulated;
Map unit is used for the control PDU after the modulation is mapped to the OFDM symbol;
Transmitting element is used to send described OFDM symbol.
20. device as claimed in claim 19 is characterized in that, described encapsulation unit is positioned at network side medium access control system MAC layer or network side radio controlling links rlc layer.
21. device as claimed in claim 20 is characterized in that, described encapsulation unit directly generates a transmission block with described control PDU, is mapped on the OFDM symbol; Perhaps, described encapsulation unit is multiplexed into a transmission block with described control PDU and data PDU, is mapped on the OFDM symbol.
22., it is characterized in that described SC adopts the variable step control mode to carry out the uplink synchronous adjustment with indication UE by different step-lengths as claim 19,20 or 21 described devices; Perhaps, described SC adopts the fixed step size control mode to carry out the uplink synchronous adjustment with indication UE by identical step-length.
23. a subscriber equipment is characterized in that, comprising:
Receiving element is used to receive the OFDM symbol;
Demultiplexing unit is used for the specific schedule information that accesses from described OFDM symbolic solution and the multiplexed information demultiplexing of SC and goes out SC and specific schedule information;
Demodulating unit is used for the SC behind the demultiplexing is carried out demodulation;
Decoding unit is used for the SC after the demodulation is decoded;
Adjustment unit is used for carrying out the uplink synchronous adjustment according to this SC synchronously.
24. a subscriber equipment is characterized in that, comprising:
Receiving element is used to receive the OFDM symbol;
Demodulating unit is used for the OFDM symbol that receives is carried out demodulation;
Decoding unit is used for the OFDM symbol after the demodulation is decoded, and obtains control corresponding PDU;
Decapsulation unit is used for taking on SC from described control PDU deblocking;
Adjustment unit is used for carrying out the uplink synchronous adjustment according to this SC synchronously.
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