CN101166073A - A cooperative collection communication method for multi-jump communication system - Google Patents
A cooperative collection communication method for multi-jump communication system Download PDFInfo
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Abstract
This invention discloses a cooperation-diversity communication method used in multi-hop communication system, in which, the following steps for the down-line direction are included: a base station gets transmission time delay from a first relay node to a mobile station and computes a regulation value of the transmission time delay of the first relay node and informs it according to the transmission time delay, the node waits for time slot of the first number after receiving a data packet and applies an empty packet code to transmit it to the mobile station, and the first number is the sum of difference of hops of the maximum value and number of hops of all data on the communication path from the second relay node to the first and 1. This invented method can guarantee that data can arrive at target nodes at the same time and realizes synchronization.
Description
Technical field
The present invention relates to multi-hop communication system, particularly a kind of collaboration diversity communication means that is applied to multi-hop communication system.
Background technology
In recent years, the communication system based on the multi-hop scheme has obtained to give more sustained attention.In the multi-hop scheme, signal sends to destination node by the one or more via nodes between source node and destination node from source node.This system has by repeating signal to come extended coverage range, increase the throughput of source node and destination node, reach set up fast wireless network advantage.
Because have the node (source node and one or more via node) of a plurality of transmission identical information in multihop system, collaboration diversity can effectively improve the transmission performance of this system.Collaboration diversity is A.Sendonaris, (the A.Sendonaris that E.Erkip and B.Aazhang proposed in 2003, E.Erkipand B.Aazhang, " User cooperation diversity, Part I; II; " IEEE Trans.Commun., vol.5l, no.11, pp.1927-1948, Nov.2003).The core implication of collaboration diversity is that a plurality of sending nodes (source node and/or via node) synchronous collaboration sends identical information, because each node is separate to the channel fading characteristic of destination node (or node of next jumping), therefore the diversity of different sending node transmission be can effectively utilize at receiving terminal, more robust and the better reception of performance obtained.Say that in essence collaboration diversity is a kind of space diversity (Virtual Space Diversity) of void.
In the multi-hop communication system of collaboration diversity, suppose that usually each cooperation sending node is synchronous, yet this is to be difficult to realize in real system.At X.Li, " Space-time codedmulti-transmission among distributed transmitters without perfectsynchronization; " IEEE Signal Process.Lett., vol.11, no.12, pp.948-951 is among the Dec.2004, the author has considered the asynchronous problem between sending node, and handles to resist this asynchronous accordingly at receiving terminal.Particularly, considered the cooperation transmission of two nodes, will send packet and be divided into two equal portions that at first node 1 sends each symbol of first in order, node 2 sends each symbol of second portion in order simultaneously; Node 1 backward sends the anti-number of the conjugate transpose of each symbol of second portion then, and node 2 backwards send the conjugate transpose of each symbol of first simultaneously.At receiving terminal, as shown in Figure 1, the propagation delay time different according to each node (d1 and d2 among Fig. 1) finds each corresponding Space-Time Block Coding pairing, and carries out demodulation, to obtain corresponding collaboration diversity.Yet, the not clear and definite propagation delay time that how to obtain different nodes in the literary composition.And, if can obtain the propagation delay time information of node, can adjust, to realize the synchronous of receiving terminal at transmitting terminal.
The research of the multihop system of existing collaboration diversity concentrates in the wireless self-organization network, rarely has the research to the multi-user access system of center control.In multi-user access system, to a certain (a bit) user's cooperation transmission, can improve this specific user's performance and handling capacity on the one hand, may reduce the throughput of whole system on the other hand.Thereby, how to control selecting collaboration via node in the multi-user system at the center, become an important problem to be solved.
Summary of the invention
The object of the present invention is to provide a kind of collaboration diversity communication means that is applied to multi-hop communication system, be implemented in the synchronous reception of destination node (travelling carriage and/or base station).
To achieve these goals, the invention provides a kind of collaboration diversity communication means that is applied to multi-hop communication system,, comprise the steps: at down direction
Information gathering procedure, base station obtain the propagation delay time of first via node to travelling carriage;
Propagation delay time adjustment calculation step, base station are notified first via node calculate the propagation delay time adjusted value of first via node to the propagation delay time of travelling carriage according to first via node after;
Data transmission step, first via node are waited for the time slot of first number after receiving packet, and after waiting for the propagation delay time adjusted value, adopt Space-Time Block Coding to be transferred to travelling carriage;
Described first number arrive from second via node for data on all communication paths data on the maximum of jumping figure of the first via node process and this communication path arrive from second via node first via node process jumping figure difference and 1 and value.
Above-mentioned method, wherein, in the described information gathering procedure, the base station also obtains the signal to noise ratio of first via node at the travelling carriage place, and simultaneously, this method also comprises:
Collaboration relay node is chosen step, utilizes first via node to select first collaboration relay node in the signal to noise ratio at travelling carriage place;
First via node in the described data transmission step is described first collaboration relay node;
Described first number arrive from second collaboration relay node for data on all communication paths data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive from second collaboration relay node first collaboration relay node process jumping figure difference and 1 and value.
Above-mentioned method, wherein, first via node of described propagation delay time adjustment calculation step is described first collaboration relay node.
Above-mentioned method wherein, also comprises:
Repeat information gathering procedure, collaboration relay node is chosen step, propagation delay time adjustment calculation step and data transmission step.
Above-mentioned method, wherein, the described cycle that repeats is relevant with the relative moving speed and the signal bandwidth of travelling carriage and via node.
Above-mentioned method, wherein, for single-carrier system, the described cycle that repeats is c/ (B*v), and wherein c is the light velocity, and B is a signal bandwidth, and v is the relative moving speed of travelling carriage and via node.
Above-mentioned method, wherein, described information gathering procedure specifically comprises:
Base station down sends a controlling packet to first via node;
First via node is forwarded to travelling carriage with described controlling packet, and writes down forwarding time T simultaneously in forwarding
0i
Travelling carriage receives described controlling packet, and the recorder time T
1iWith the signal to noise ratio of first via node at the travelling carriage place;
Travelling carriage produces a upload control bag and sends to first via node, comprises described time of reception T in this upload control bag
1i, the upload control bag transmitting time T
2iWith the signal to noise ratio of first via node at the travelling carriage place;
First via node writes down corresponding time of reception T after receiving the upload control bag
Ei, and calculate after the propagation delay time and to send to the base station after described propagation delay time write the upload control bag, described propagation delay time is:
Delay
i1＝[(T
Ei-T
0i)-(T
2i-T
1i)]/2
The base station receives described upload control bag, obtains via node to the propagation delay time of travelling carriage and first via node signal to noise ratio at travelling carriage from described upload control bag;
Wherein i is the sequence number of first via node.
Above-mentioned method, wherein, collaboration relay node is chosen in the step, only be chosen in first via node of the signal to noise ratio at travelling carriage place more than or equal to first numerical value, described first numerical value is all first via nodes the maximum of the signal to noise ratio at travelling carriage place and one greater than 0 and less than the product of 1 coefficient.
Above-mentioned method wherein, only has one first via node in the signal to noise ratio at travelling carriage place during more than or equal to first numerical value, the descending collaboration communication that do not carry out; When the signal to noise ratio at travelling carriage place exceeds maximum collaboration relay node and counts more than or equal to the first via node number of first numerical value, a plurality of first via nodes of choosing the signal to noise ratio maximum carry out down collaboration communication, and the number of first via node of selection is maximum collaboration relay node number.
Above-mentioned method, wherein, number and the sequence number of this first collaboration relay node in downlink transfer according to first collaboration relay node in the data transmission step are selected corresponding Space-Time Block Coding.
In order better to realize above-mentioned purpose, the present invention also provides a kind of collaboration diversity communication means that is applied to multi-hop communication system, at up direction, comprises the steps:
Information gathering procedure, base station obtain the propagation delay time of second via node to the base station;
Propagation delay time adjustment calculation step, base station are notified second via node calculate the propagation delay time adjusted value of second via node to the propagation delay time of base station according to second via node after;
Data transmission step, second via node are waited for the time slot of second number after receiving packet, and after waiting for the propagation delay time adjusted value, adopt Space-Time Block Coding to be transferred to the base station;
Described second number arrive from second via node for data on all communication paths data on the maximum of jumping figure of the first via node process and this communication path arrive from second via node first via node process jumping figure difference and 1 and value.
Above-mentioned method, wherein, in the information gathering procedure, the base station also obtains the signal to noise ratio of second via node at the place, base station, and this method also comprises:
Collaboration relay node is chosen step, utilizes second via node to select second collaboration relay node in the signal to noise ratio at place, base station;
Second via node in the described data transmission step is described second collaboration relay node;
Described first number arrive from second collaboration relay node for data on all communication paths data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive from second collaboration relay node first collaboration relay node process jumping figure difference and 1 and value.
Above-mentioned method, wherein, second via node of described propagation delay time adjustment calculation step is described second collaboration relay node.
Above-mentioned method wherein, also comprises:
Repeat information gathering procedure, collaboration relay node is chosen step, propagation delay time adjustment calculation step and data transmission step.
Above-mentioned method, wherein, the described cycle that repeats is relevant with the relative moving speed and the signal bandwidth of base station and via node.
Above-mentioned method, wherein, for single-carrier system, the described cycle that repeats is c/ (B*v), and wherein c is the light velocity, and B is a signal bandwidth, and v is the relative moving speed of base station and via node.
Above-mentioned method, wherein, described information gathering procedure specifically comprises:
The base station sends a descending controlling packet to second via node, and record issues the very first time of controlling packet;
Second via node receives the descending controlling packet from the base station, and recorder is to second time of descending controlling packet;
Second via node produces the upload control bag and sends the base station, comprises in this upload control bag that described second time and second via node send the 3rd time of this upload control bag;
The 4th corresponding time is write down after receiving the upload control bag in the base station, and obtain the signal to noise ratio of via node for the base station, calculate the propagation delay time of second via node to the base station simultaneously, second via node for the BS propagation delay time is: [(the 4th time-very first time)-(the 3rd time-the second time)]/2.
Above-mentioned method, wherein, collaboration relay node is chosen in the step, only be chosen in second via node of the signal to noise ratio at base station place more than or equal to second value, described second value is all second via nodes the maximum of the signal to noise ratio at travelling carriage place and one greater than 0 and less than the product of 1 coefficient.
Above-mentioned method wherein, only has one second via node in the signal to noise ratio at base station place during more than or equal to second value, the up collaboration communication that do not carry out; When the signal to noise ratio at base station place exceeds maximum collaboration relay node and counts more than or equal to the second via node number of second value, a plurality of second via nodes of choosing the signal to noise ratio maximum carry out uplink coordinated communication, and the number of second via node of selection is maximum collaboration relay node number.
Above-mentioned method, wherein, number and the sequence number of this second collaboration relay node in uplink according to second collaboration relay node in the data transmission step are selected corresponding Space-Time Block Coding.
The collaboration diversity communication means that is applied to multi-hop communication system of the present invention, at last/down direction, notify via node after obtaining propagation delay time adjusted value with the via node of base station/travelling carriage direct communication by the base station, and receive with the via node of base station/travelling carriage direct communication/downlink data packet after, wait for certain time slot, and on carrying out behind the wait time delay wait propagation delay time adjusted value/downlink transfer, guarantee that the transmission data arrive base station/travelling carriage simultaneously.
Simultaneously, in the method for the present invention, select collaboration relay node, in the performance and handling capacity of considering the user, considered the throughput of whole system according to certain criterion.
Description of drawings
Receiving terminal demodulation schematic diagram when Fig. 1 is two node cooperation communications;
Fig. 2 is the simplified diagram of the application network of method of the present invention;
Fig. 3 is applied to descending schematic flow sheet for method of the present invention;
Fig. 4 is the simplified diagram of the application network of the first embodiment of the present invention;
Fig. 5 is the schematic diagram of a kind of demodulation method of receiving terminal among the present invention;
Fig. 6 is the simplified diagram of the application network of the second embodiment of the present invention;
Fig. 7 and Fig. 8 are the simplified diagram of two kinds of situations of the application network of the third embodiment of the present invention.
Embodiment
Understand for convenient, earlier some notions that the present invention relates to are necessarily illustrated at this.
In the present invention, at down direction, taking into account system is a central control system, the user's that all are new access, and all by the unified control of base station BS, directly each node (the via node RS/ mobile station MS/subscriber station SS) downlink transfer that links to each other with BS is synchronous.
And at up direction, nonsynchronous situation is considered in each node (the via node RS/ mobile station MS/subscriber station SS) uplink that directly links to each other with BS in the system among the present invention.
Simultaneously, for convenience of description, will with via node called after first via node of travelling carriage direct communication, with first via node, first collaboration relay node of selected participation collaboration communication; Will with via node called after second via node of BS direct communication, with second via node, second collaboration relay node of selected participation collaboration communication.
Below in conjunction with Fig. 2 above-mentioned notion is described.
As shown in Figure 2, wherein, supposing to have following three transmission paths between BS and the MS: BS-RS1-MS, BS-RS2-RS4-MS and BS-RS3-RS5-RS6-MS, yet in the practical communication process, have only this two transmission paths of BS-RS1-MS and BS-RS2-RS4-MS selected, then RS1, RS4, RS6 are first via node, and RS1, RS4 are first collaboration relay node, and then RS1, RS2, RS3 are second via node, and RS1, RS2 are second collaboration relay node.
Simultaneously, also need to prove, situation for multi-hop, with regard to central control system, situation for up-downgoing, the slot s lot of each via node is on all four, and promptly a plurality of first collaboration relay node are the multiple of time slot to the time difference that MS issues packet, and second collaboration relay node is the multiple of time slot to the time difference that BS sends packet.
Be example equally with Fig. 2, in the drawings, use BS-＞RS2-＞RS4-＞MS and BS-＞RS3-＞RS5-＞RS6-＞MS two transmission paths when supposing actual transmissions, because RS2 directly links to each other with BS with RS3, its up-downgoing transmission is synchronous, and data can be finished at 1 time slot from RS2 to RS4, and data can be finished at 2 time slots from RS3 to RS6, therefore packet arrives RS4 and RS6 in adjacent time-slots, simultaneously, RS4 and RS6 can send to MS after receiving packet at next time slot, so RS4 and RS6 issue packet to MS and also differ 1 time slot.The rest may be inferred, and first collaboration relay node issues packet to MS may differ a plurality of time slots.
The collaboration diversity communication means that is applied to multi-hop communication system of the present invention comprises the steps: at down direction as shown in Figure 3
Information gathering procedure, base station BS obtain the first via node RS to the propagation delay time of mobile station MS, first via node signal to noise ratio snr at the mobile station MS place;
Collaboration relay node is chosen step, considers user's the receptivity and the overall throughput of system, utilizes the SNR of first via node at the mobile station MS place to select first collaboration relay node;
At this, having only just can be selected as collaboration relay node during more than or equal to one first numerical value at the SNR at mobile station MS place when first via node, and this first numerical value is all first via nodes the maximum of the SNR at mobile station MS place and one greater than 0 and less than the product of 1 coefficient;
Propagation delay time adjustment calculation step, base station BS calculates the propagation delay time adjusted value of first collaboration relay node according to first collaboration relay node to the propagation delay time of travelling carriage, and notifies first collaboration relay node;
Data transmission step, first collaboration relay node adopt STBC (SpaceTime Block Code after receiving packet, marshalling sign indicating number when empty), and wait for the time slot of first number, and carry out downlink transfer after continuing to wait for the propagation delay time adjusted value, guarantee that the transmission data arrive mobile station MS simultaneously.
Wherein this first number arrive from second collaboration relay node for data on all communication paths data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive from second collaboration relay node first collaboration relay node process jumping figure difference and 1 and value.
At this, need to add 1 reason in the calculating of this first number and be described below:
Even because under the situation of communication path fully symmetrical (jumping figure is identical), first collaboration relay node is after receiving data, also can carry out forwarding of data at next time slot, therefore, this first number can not be 0, and promptly first collaboration relay node needs at least after receiving data to wait for that 1 time slot (next time slot) just carries out the transmission of data.
The collaboration diversity communication means that is applied to multi-hop communication system of the present invention comprises the steps: at up direction
Information gathering procedure, base station BS obtain the second via node RS to the propagation delay time of base station and second via node signal to noise ratio snr at the base station BS place;
Collaboration relay node is chosen step, considers user's the receptivity and the overall throughput of system, utilizes second via node to select second collaboration relay node at the signal to noise ratio snr at base station BS place;
At this, having only just can be selected as collaboration relay node during more than or equal to a second value at the SNR at base station BS place when second via node, and this second value is all second via nodes the maximum of the SNR at base station BS place and one greater than 0 and less than the product of 1 coefficient.
Propagation delay time adjustment calculation step, base station BS calculates the propagation delay time adjusted value of second collaboration relay node according to second collaboration relay node to the propagation delay time of base station, and notifies second collaboration relay node;
Data transmission step, second collaboration relay node is waited for the time slot of second number after receiving packet, and carries out uplink after waiting for the propagation delay time adjusted value, and adopt STBC to carry out uplink by second collaboration relay node, guarantee that the transmission data arrive BS simultaneously.
Wherein this second number arrive from second collaboration relay node for data on all communication paths data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive from second collaboration relay node first collaboration relay node process jumping figure difference and 1 and value.
Wherein STBC sign indicating number and collaboration relay node number and the sequence number of choosing the relaying cooperative node of selecting in the step is relevant, and this will be elaborated in the specific embodiment below.
Below method of the present invention is elaborated with 3 specific embodiments.In specific embodiments of the invention, be that example describes all with 2 transmission paths.
＜the first embodiment 〉
In first embodiment, with network condition shown in Figure 4 is that example describes, all via nodes are all simultaneously as first via node and second via node (promptly all transmission paths all are the situation of double bounce), the situation of 2 via nodes only is shown among the figure, but method of the present invention is not limited to 2 via nodes, can be used for the situation of plural via node simultaneously.
Following elder generation describes with the situation that method of the present invention is applied to down direction.
In the information gathering procedure, base station BS obtains via node to the propagation delay time of mobile station MS and first via node SNR at the mobile station MS place.
Below information gathering procedure is elaborated, specifically comprises the steps:
Steps A 1, controlling packet of the descending transmission of BS is to each via node RS
i
Steps A 2, each via node RS
iTransmit this controlling packet to destination node MS, and write down forwarding time T simultaneously in forwarding
0i
Steps A 3, MS receives from via node RS
iThe forwarding bag, and separately time of reception T of record
1iWith received signal to noise ratio SNR
I1
Steps A 4, MS produces a upload control bag, and in T
2iConstantly send to each RS
i, wherein comprise time of reception T in this upload control bag
1i, the upload control bag transmitting time T
2iWith received signal to noise ratio SNR
I1
Steps A 5, each RS
iWrite down corresponding time of reception T after receiving the upload control bag
Ei, and calculate propagation delay time Delay
I1After with this propagation delay time Delay
I1Send to BS after writing the upload control bag, wherein propagation delay time Delay
I1As follows:
Delay
i1＝[(T
Ei-T
0i)-(T
2i-T
1i)]/2
Steps A 6, BS receives each RS
iThe upload control bag that sends.
By above-mentioned step, BS can obtain the propagation delay time Delay of first via node to mobile station MS
I1With the SNR of first via node at the mobile station MS place
I1
After having obtained these data, BS can carry out the selection of via node, promptly selects collaboration relay node.
In the present embodiment via node need satisfy following inequality just can selected collaboration relay node as down direction:
SNR
i1≥A*max(SNR
i1)0＜A＜1
Wherein, this A value is big more, and the collaboration relay node that may select is few more, and the A value is more little, and the collaboration relay node that may select is many more, therefore can select different A values as required, and then selects the via node of some to transmit.
Simultaneously, utilize above-mentioned judgement formula, can better improve the transmission performance of system so that the gap between the SNR of selecteed collaboration relay node is as far as possible little.
At this moment, when selecting multiple situation can appear:
A via node meets the demands, the descending collaboration communication that do not carry out;
A plurality of via nodes meet the demands, and then carry out collaboration communication, and enter propagation delay time adjustment calculation procedure.
Certainly, when default maximum collaboration relay node number, and the via node number that meets the demands just enters propagation delay time and adjusts calculation procedure when exceeding this maximum collaboration relay node and counting after also needing further to select.At this, the present invention chooses a plurality of RS with maximum signal to noise ratio, adjusts calculation procedure as entering propagation delay time behind the final cooperation transmission via node.
In propagation delay time adjustment calculation step, at first BS obtains the propagation delay time Delay of first collaboration relay node and mobile station MS
I1Maximum, and the difference of this maximum and first collaboration relay node and the propagation delay time of mobile station MS needed the time T waited for as the first corresponding collaboration relay node after receiving packet
i(to the transmission delay of target MS).
BS sends notification list to all collaboration relay node, comprises in the table: participate in the number of the RS of cooperation transmission, the sequence number of each first collaboration relay node in transmission and the transmission delay to target MS that need adjust thereof.
Behind the first collaboration relay node reception notification table, according to the cooperation transmission RS number N in the table with concentrating (the code book collection of the storage of each RS is identical) correspondence choosing i group code the N-STBC code book from Space-Time Block Coding (STBC) code book that storage is good in advance from the sequence number i in transmission, empty time-code as the data transfer phase modulation is standby, and record T
iTransmission delay when transmitting as each down collaboration.
After having finished above-mentioned action, promptly enter data transmission step.
In the data transmission step, each first collaboration relay node is received after the packet, because data are identical from the jumping figure that second collaboration relay node arrives the first collaboration relay node process in the present embodiment, being 0 jumps, therefore, only need to consider the propagation delay time of first collaboration relay node and mobile station MS, all adopt selected STBC sign indicating number to transmit at adjusted transmission delay.STBC can symbolization be basic, and it is basic also can adopting packet, by user's factors such as translational speed decision, does not do further qualification here.
And if in the problem that receiving terminal exists multipath expansion to cause, then can adopt all kinds of equalization algorithms to handle, also do not do further qualification.
As shown in Figure 4, with 2 collaboration relay node, adopt the STBC transmission on packet basis at this, symbolization serial cancellation equalization methods is an example, and concrete steps are as follows:
At the first relaying cooperative node, as shown in Figure 4:
To send packet and be divided into two equal portions, at first node 1 sends each symbol of first in order, and node 2 sends each symbol of second portion in order simultaneously; For multicarrier system, be left intact, directly send the anti-number of the conjugate transpose of each symbol of second portion by node 1 order, node 2 orders send the conjugate transpose of each symbol of first simultaneously.
And for single-carrier system; in order to eliminate the influence of first to second portion; just sent the anti-number of the conjugate transpose of each symbol of second portion after the protection that adds certain-length at interval by node 1 order, node 2 orders send the conjugate transpose of each symbol of first simultaneously.
At receiving terminal, for multicarrier system, handle to get final product according to existing multi-carrier receiver, and for single-carrier system, as shown in Figure 5, and for the situation in 3 footpaths, processing that can be in the following way:
At first use first symbol that the STBC decoding technique solves two parts;
According to the result of channel estimating, estimate the second footpath transmission of first symbol of two parts, and cancellation from the sampling of second symbol;
Use second symbol that the STBC decoding technique solves two parts;
According to the result of channel estimating, estimate the 3rd footpath transmission of first symbol of two parts and the second footpath transmission of second symbol, and cancellation from the sampling of the 3rd symbol;
Use the 3rd symbol that the STBC decoding technique solves two parts;
And the like, solve all symbols, obtain final detection result.
Above-mentioned explanation be the explanation that method of the present invention is applied to down direction, for up direction, as described below.
In the information gathering procedure, base station BS obtains second via node to the propagation delay time of base station and second via node signal to noise ratio snr at the base station BS place, and it is specifically realized by following steps:
Steps A 1 ', descending controlling packet of the descending transmission of BS is to each via node RS
i, and record issues the very first time of controlling packet;
Steps A 2 ', each via node RS
iReception is from the descending controlling packet of BS, and recorder is to second time of this controlling packet;
Steps A 3 ', each via node RS
iProduce the upload control bag, and send to the base station, comprise second time and the 3rd time in this upload control bag in the 3rd time;
Steps A 4 ', BS writes down corresponding time of reception (the 4th time) after receiving the upload control bag, and obtains the SNR of each second via node for BS, calculates the propagation delay time of via node to the base station simultaneously, and each via node for the BS propagation delay time is:
[(the 4th time-very first time)-(the 3rd time-the second time)]/2
And via node need satisfy the collaboration relay node that following inequality just can selected up direction:
SNR
i2≥A*max(SNR
i2)0＜A＜1
Other processing and descending handling process have corresponding relation, and those of ordinary skills can not need creative work can be applied to uplink situation, therefore repeat no more.
Certainly, can be used for up-downgoing simultaneously, but should be noted that when being used for up-downlink direction simultaneously, because all via nodes are all simultaneously as first via node and second via node, via node need satisfy following two inequality just can be selected:
Therefore might not meet the demands by all via nodes, run into this situation and then do not carry out collaboration communication, have maximum combined signal to noise ratio J
i=SNR
I1* SNR
I2Via node be selected and carry out transmission process.
Certainly the possibility below same the existence:
A via node meets the demands, and does not carry out collaboration communication equally;
A plurality of via nodes meet the demands, and then collaboration communication is all carried out in up-downgoing, and enter propagation delay time adjustment calculation procedure.
Certainly, when default maximum collaboration relay node number, and the via node number that meets the demands just enters propagation delay time and adjusts calculation procedure when exceeding this maximum collaboration relay node and counting after also needing further to select.At this, the present invention chooses a plurality of RS with maximum signal to noise ratio, adjusts calculation procedure as entering propagation delay time behind the final cooperation transmission via node.
＜the second embodiment 〉
In a second embodiment, with network condition shown in Figure 6 is that example describes, all transmission paths all surpass double bounce, but jumping figure is identical, but only describe in the present embodiment with 3 situations of jumping, be that example describes only also simultaneously, but should be appreciated that method of the present invention can be applied to the situation of 2 above transmission paths equally with 2 transmission paths.
In the information gathering procedure:
For descending situation, base station BS obtains first via node to the propagation delay time of mobile station MS and first via node SNR at the mobile station MS place;
For uplink situation, base station BS obtains second via node to the propagation delay time of base station and second via node signal to noise ratio snr at the base station BS place.
Following elder generation is elaborated with regard to descending situation.
Be illustrated in front, with regard to central control system, the slot s lot of each via node is on all four, so base station BS obtains first via node and specifically comprises in the step of the SNR at mobile station MS place to the propagation delay time and first via node of mobile station MS:
Step B1, slot1, controlling packet of the descending transmission of BS is to each second via node RS
i
Step B2, slot2, each second via node RS
iTransmit this controlling packet to the first corresponding via node RS
j
Step B3, slot3, the first via node RS
jTransmit this controlling packet to destination node MS, and write down forwarding time T simultaneously in forwarding
0i
Step B4, MS receives from each first via node RS
jThe controlling packet of forwarding, and record time of reception T separately
1iWith received signal to noise ratio SNR
I1
Step B5, slot4, MS produce one and comprise corresponding to each RS
iReceived signal to noise ratio SNR
I1With time of reception T
1iThe upload control bag of information, and in T
2iSend constantly;
Step B6, each first via node RS
jWrite down corresponding time of reception T after receiving the upload control bag
Ei, and calculate propagation delay time Delay
I1After with this propagation delay time Delay
I1Write the upload control bag; Propagation delay time Delay wherein
I1As follows:
Delay
i1＝[(T
Ei-T
0i)-(T
2i-T
1i)]/2
Step B7, slot5, each first via node RS
jTo comprise propagation delay time Delay
I1The upload control bag send to the second corresponding via node RS
i
Step B8, slot6, the second via node RS
iThe upload control bag is forwarded to BS;
Step B9, BS receive each second via node RS
iThe upload control bag that sends.
By above-mentioned step, BS can obtain the propagation delay time Delay of first via node to mobile station MS
I1With the SNR of first via node at the mobile station MS place
I1
After having obtained these data, BS can carry out the selection of via node, promptly selects collaboration relay node.
For first via node, it need satisfy just can be selected as the down collaboration via node with lower inequality:
SNR
i1≥A*max(SNR
i1)0＜A＜1
A via node meets the demands, the descending collaboration communication that do not carry out;
A plurality of via nodes meet the demands, and then enter propagation delay time and adjust calculation procedure.
Certainly, when default maximum collaboration relay node number, and the via node number that meets the demands exceeds this maximum collaboration relay node when counting, also need further to select, at this, the present invention chooses a plurality of RS with maximum signal to noise ratio, adjusts calculation procedure as entering propagation delay time behind the final cooperation transmission via node.
And the calculating of propagation delay time adjusted value and first embodiment are identical, do not repeat them here.
BS sends notification list to the via node that all participate in cooperation transmission simultaneously, comprises in the table: the number N that participates in the RS of down collaboration transmission
u, the sequence number of each RS in transmission and the transmission delay that need adjust thereof to target MS.
Behind the first collaboration relay node reception notification table, according to the transmission of the down collaboration in table RS number N
DWith concentrating (the code book collection of the storage of each RS is identical) correspondence choosing N from the sequence number i in transmission from Space-Time Block Coding (STBC) code book that storage is good in advance
DI group code in the-STBC code book, standby as the empty time-code of data transfer phase modulation, and record T
iTransmission delay when transmitting as each down collaboration.
And,, therefore only need to consider the propagation delay time of first collaboration relay node and mobile station MS because the jumping figure of transmission path is identical in the processing of data transfer phase, and identical with first embodiment, do not repeat them here.
For the uplink direction, the difference of the present embodiment and first embodiment is that transmission path is all above double bounce, but because the jumping figure of transmission path is all identical, consider that native system is the crackization, therefore data can transmit upstream to second collaboration relay node at same time slot, therefore second collaboration relay node only needs to consider the propagation delay time of second collaboration relay node and base station, and all processing are identical with first embodiment.
Simultaneously, if wish in a handling process, to obtain simultaneously first via node to the propagation delay time of mobile station MS, first via node at the SNR at mobile station MS place, second via node to the propagation delay time of base station BS and second via node SNR at the base station BS place, only need the information gathering procedure of down direction is suitably adjusted and can be realized, as described below:
Among the step B1, record very first time when BS issues controlling packet;
Among the step B2, the second via node RS
iWrite down for second time when transmitting this controlling packet;
Among the step B8, the second via node RS
iWhen the upload control bag is forwarded to BS, also second time and forwarding time (the 3rd time) are write the upload control bag;
Among the step B9, BS writes down corresponding time of reception (the 4th time) after receiving the upload control bag, and obtains the SNR of each second via node for BS.
Like this, BS just can obtain simultaneously first via node to the propagation delay time of mobile station MS, first via node at the SNR at mobile station MS place, second via node to the propagation delay time of base station BS and second via node SNR at the base station BS place, wherein second via node to the propagation delay time of base station BS is:
[(the 4th time-very first time)-(the 3rd time-the second time)]/2
＜the three embodiment 〉
The identical situation of jumping figure that two embodiment in front are transmission path, as shown in Figure 7 and Figure 8, present embodiment describes with the different situation of the jumping figure of transmission path, the 3rd embodiment is that example describes with 2 transmission paths only also simultaneously, but should be appreciated that method of the present invention can be applied to the situation of 2 above transmission paths equally.
For situation shown in Figure 7, the difference of itself and second embodiment is, a RS is arranged simultaneously as first collaboration relay node and second collaboration relay node, simultaneously, the jumping figure difference of transmission path, therefore the difference of the processing mode of itself and second embodiment is that transmit stage need consider that data arrive the jumping figure M of the first collaboration relay node process from second collaboration relay node
nPromptly the first/the second collaboration relay node carry out descending/need wait for the time slot of some during uplink, number that need to wait for time slot arrives data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive the first collaboration relay node process from second collaboration relay node jumping figure poor from second collaboration relay node for data on all communication paths, and the propagation delay time adjusted value is constant.
Simultaneously, owing to a RS is arranged simultaneously as first collaboration relay node and second collaboration relay node, therefore, when up-downgoing is simultaneously applied, simultaneously as the via node of first collaboration relay node and second collaboration relay node after receiving notification list, need be according to uplink coordinated transmission RS number and uplink coordinated sequence number in the table, concentrate (the code book collection of the storage of each RS is identical) from Space-Time Block Coding (STBC) code book that storage in advance is good, choose corresponding sign indicating number as data transfer phase, the empty time-code that modulation was adopted when upstream data was transmitted is standby; And according to down collaboration transmission RS number and down collaboration sequence number in the table, concentrate (the code book collection of the storage of each RS is identical) from Space-Time Block Coding (STBC) code book that storage in advance is good, choose corresponding sign indicating number conduct as data transfer phase, the empty time-code that modulation was adopted when downlink data was transmitted is standby.
And for situation shown in Figure 8, the difference of itself and second embodiment is that data transfer phase need consider that data arrive the jumping figure M of the first collaboration relay node process from second collaboration relay node
nPromptly the first/the second collaboration relay node carry out descending/need wait for the time slot of some during uplink, number that need to wait for time slot arrives data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive the first collaboration relay node process from second collaboration relay node jumping figure poor from second collaboration relay node for data on all communication paths, and the propagation delay time adjusted value is constant.
All do not consider relatively moving between MS and the RS among 3 above-mentioned embodiment, and mobility can cause the variation of Delay and SNR, therefore, better effect can be arranged, in each embodiment, all can periodically repeat in order to make the present invention, repetition period is relevant with relative moving speed and signal bandwidth, for single-carrier system, the cycle that can adopt is c/ (B*v), and wherein c is the light velocity, B is a signal bandwidth, and v is a relative moving speed.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (20)
1. a collaboration diversity communication means that is applied to multi-hop communication system is characterized in that, at down direction, comprises the steps:
Information gathering procedure, base station obtain the propagation delay time of first via node to travelling carriage;
Propagation delay time adjustment calculation step, base station are notified first via node calculate the propagation delay time adjusted value of first via node to the propagation delay time of travelling carriage according to first via node after;
Data transmission step, first via node are waited for the time slot of first number after receiving packet, and after waiting for the propagation delay time adjusted value, adopt Space-Time Block Coding to be transferred to travelling carriage;
Described first number arrive from second via node for data on all communication paths data on the maximum of jumping figure of the first via node process and this communication path arrive from second via node first via node process jumping figure difference and 1 and value.
2. method according to claim 1 is characterized in that, in the described information gathering procedure, the base station also obtains the signal to noise ratio of first via node at the travelling carriage place, and simultaneously, this method also comprises:
Collaboration relay node is chosen step, utilizes first via node to select first collaboration relay node in the signal to noise ratio at travelling carriage place;
First via node in the described data transmission step is described first collaboration relay node;
Described first number arrive from second collaboration relay node for data on all communication paths data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive from second collaboration relay node first collaboration relay node process jumping figure difference and 1 and value.
3. method according to claim 2 is characterized in that, first via node of described propagation delay time adjustment calculation step is described first collaboration relay node.
4. according to claim 2 or 3 described methods, it is characterized in that, also comprise:
Repeat information gathering procedure, collaboration relay node is chosen step, propagation delay time adjustment calculation step and data transmission step.
5. method according to claim 4 is characterized in that, the described cycle that repeats is relevant with the relative moving speed and the signal bandwidth of travelling carriage and via node.
6. method according to claim 5 is characterized in that, for single-carrier system, the described cycle that repeats is c/ (B
*V), wherein c is the light velocity, and B is a signal bandwidth, and v is the relative moving speed of travelling carriage and via node.
7. according to claim 2 or 3 described methods, it is characterized in that described information gathering procedure specifically comprises:
Base station down sends a controlling packet to first via node;
First via node is forwarded to travelling carriage with described controlling packet, and writes down forwarding time T simultaneously in forwarding
0i
Travelling carriage receives described controlling packet, and the recorder time T
1iWith the signal to noise ratio of first via node at the travelling carriage place;
Travelling carriage produces a upload control bag and sends to first via node, comprises described time of reception T in this upload control bag
1i, the transmitting time T2i of upload control bag and first via node be in the signal to noise ratio at travelling carriage place;
First via node writes down corresponding time of reception T after receiving the upload control bag
Ei, and calculate after the propagation delay time and to send to the base station after described propagation delay time write the upload control bag, described propagation delay time is:
Delay
i1＝[(T
Ei-T
0i)-(T
2i-T
1i)]/2
The base station receives described upload control bag, obtains via node to the propagation delay time of travelling carriage and first via node signal to noise ratio at travelling carriage from described upload control bag;
Wherein i is the sequence number of first via node.
8. according to claim 2 or 3 described methods, it is characterized in that, collaboration relay node is chosen in the step, only be chosen in first via node of the signal to noise ratio at travelling carriage place more than or equal to first numerical value, described first numerical value is all first via nodes the maximum of the signal to noise ratio at travelling carriage place and one greater than 0 and less than the product of 1 coefficient.
9. method according to claim 8 is characterized in that, one first via node is only arranged in the signal to noise ratio at travelling carriage place during more than or equal to first numerical value, the descending collaboration communication that do not carry out; When the signal to noise ratio at travelling carriage place exceeds maximum collaboration relay node and counts more than or equal to the first via node number of first numerical value, a plurality of first via nodes of choosing the signal to noise ratio maximum carry out down collaboration communication, and the number of first via node of selection is maximum collaboration relay node number.
10. according to claim 2 or 3 described methods, it is characterized in that number and the sequence number of this first collaboration relay node in downlink transfer according to first collaboration relay node in the data transmission step are selected corresponding Space-Time Block Coding.
11. a collaboration diversity communication means that is applied to multi-hop communication system is characterized in that, at up direction, comprises the steps:
Information gathering procedure, base station obtain the propagation delay time of second via node to the base station;
Propagation delay time adjustment calculation step, base station are notified second via node calculate the propagation delay time adjusted value of second via node to the propagation delay time of base station according to second via node after;
Data transmission step, second via node are waited for the time slot of second number after receiving packet, and after waiting for the propagation delay time adjusted value, adopt Space-Time Block Coding to be transferred to the base station;
Described second number arrive from second via node for data on all communication paths data on the maximum of jumping figure of the first via node process and this communication path arrive from second via node first via node process jumping figure difference and 1 and value.
12. method according to claim 11 is characterized in that, in the information gathering procedure, the base station also obtains the signal to noise ratio of second via node at the place, base station, and this method also comprises:
Collaboration relay node is chosen step, utilizes second via node to select second collaboration relay node in the signal to noise ratio at place, base station;
Second via node in the described data transmission step is described second collaboration relay node;
Described first number arrive from second collaboration relay node for data on all communication paths data on the maximum of jumping figure of the first collaboration relay node process and this communication path arrive from second collaboration relay node first collaboration relay node process jumping figure difference and 1 and value.
13. method according to claim 12 is characterized in that, second via node of described propagation delay time adjustment calculation step is described second collaboration relay node.
14. according to claim 12 or 13 described methods, it is characterized in that, also comprise:
Repeat information gathering procedure, collaboration relay node is chosen step, propagation delay time adjustment calculation step and data transmission step.
15. method according to claim 14 is characterized in that, the described cycle that repeats is relevant with the relative moving speed and the signal bandwidth of base station and via node.
16. method according to claim 15 is characterized in that, for single-carrier system, the described cycle that repeats is c/ (B
*V), wherein c is the light velocity, and B is a signal bandwidth, and v is the relative moving speed of base station and via node.
17., it is characterized in that described information gathering procedure specifically comprises according to claim 12 or 13 described methods:
The base station sends a descending controlling packet to second via node, and record issues the very first time of controlling packet;
Second via node receives the descending controlling packet from the base station, and recorder is to second time of descending controlling packet;
Second via node produces the upload control bag and sends the base station, comprises in this upload control bag that described second time and second via node send the 3rd time of this upload control bag;
The 4th corresponding time is write down after receiving the upload control bag in the base station, and obtain the signal to noise ratio of via node for the base station, calculate the propagation delay time of second via node to the base station simultaneously, second via node for the BS propagation delay time is: [(the 4th time-very first time)-(the 3rd time-the second time)]/2.
18. according to claim 12 or 13 described methods, it is characterized in that, collaboration relay node is chosen in the step, only be chosen in second via node of the signal to noise ratio at base station place more than or equal to second value, described second value is all second via nodes the maximum of the signal to noise ratio at travelling carriage place and one greater than 0 and less than the product of 1 coefficient.
19. method according to claim 18 is characterized in that, one second via node is only arranged in the signal to noise ratio at base station place during more than or equal to second value, the up collaboration communication that do not carry out; When the signal to noise ratio at base station place exceeds maximum collaboration relay node and counts more than or equal to the second via node number of second value, a plurality of second via nodes of choosing the signal to noise ratio maximum carry out uplink coordinated communication, and the number of second via node of selection is maximum collaboration relay node number.
20., it is characterized in that number and the sequence number of this second collaboration relay node in uplink according to second collaboration relay node in the data transmission step are selected corresponding Space-Time Block Coding according to claim 12 or 13 described methods.
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| CNA2006101357149A CN101166073A (en) | 2006-10-17 | 2006-10-17 | A cooperative collection communication method for multi-jump communication system |
| JP2007269887A JP2008104184A (en) | 2006-10-17 | 2007-10-17 | Cooperative diversity communication method applied to multi-hop communication system |
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