CN108495275B - Two-stage cooperative multicast method based on relay - Google Patents
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- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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Abstract
The invention relates to a relay-based two-stage cooperative multicast method, which comprises the following steps: the system takes a frame as a scheduling period and divides each frame into two time slots; the base station continuously broadcasts data in two time slots of each frame; in the first time slot of each frame, the second class relay forwards the information after interference elimination, and the first class relay receives the forwarding information from the second class relay and the information sent by the base station in the current time slot; in a second time slot of each frame, the first class relay sends information after interference elimination, and the second class relay receives forwarding information from the first class relay and information sent by the base station in the current time slot; and the remote user receives the information forwarded by the second type of relay in the first time slot of each frame and receives the information forwarded by the first type of relay in the second time slot of each frame. It should be noted that the remote user cannot correctly receive the information transmitted by the base station, and the signal transmitted by the base station is considered to be a weak interference signal. The invention has the advantage of improving the resource utilization rate and the overall throughput of the system.
Description
Technical Field
The invention relates to a two-stage cooperative multicast method based on relay transmission, and belongs to the technical field of wireless communication.
Background
With the rapid development of broadband data services, cellular networks are demanding advanced technologies to gain high-capacity broadband access. As multimedia services are still dominating in mobile data growth, providing high quality multimedia services within a limited bandwidth becomes a hot topic, and wireless multicast becomes a spectrally efficient way of exploiting radio broadcasting properties in wireless transmission. Multicast services are a way of one-to-many transmission in a wireless network, and a service provider can simultaneously transmit multimedia data for a plurality of users. The traditional multicast mode has low resource utilization rate, is limited by the user with the worst channel, has the problems of uneven resource scheduling among multicast groups, unreasonable resource allocation in the multicast groups and the like, and is difficult to achieve the balance between fairness and total throughput and obtain the best benefit.
To the knowledge of the applicant, for the problems existing in the conventional Multicast transmission, the bandwidth effective method proposed by Hou F et al to satisfy the fairness and throughput requirements at the same time is to use Cooperative Multicast (CM) to complete resource scheduling, which introduces a relay cooperation concept in the conventional Multicast system and uses multi-user diversity to improve the Multicast data transmission rate; the cooperative multicast studied by Garg J et al can effectively combat the effects of path loss and channel fading and further increase the multicast system capacity; the cooperative multicast with SC (selective combining) proposed by Liu H et al provides better coverage, which can achieve up to 43% power saving compared to the conventional multicast, while the cooperative multicast with CPC (cyclic prefix combining) is further studied on the basis of the SC scheme, which can provide stronger signal reception and energy saving compared to the SC scheme.
Cooperative multicast is a scheme that is further improved and studied on the basis of multicast transmission, and divides transmission into several stages, as shown in fig. 1, and is a two-stage cooperative multicast scheme. In the first stage, a Base Station (BS) performs high-rate broadcasting, and after successfully receiving data, part of Mobile Stations (MSs) become Successful Mobile Stations (SMSs); the successful Mobile terminals in the second stage act as Mobile Relays (MRs) for forwarding data to the remaining Mobile terminals (ums) that have not successfully received the data. The cooperative multicast scheme can effectively acquire path loss gain and diversity gain, and improves the overall performance of the system. However, the existing cooperative multicast generally has the following problems: in the second stage of cooperative multicast, the BS is in a data non-sending state, the whole system only uses half of the time to complete transmission of new data, and the other half of the time is used to complete forwarding of the MRs data, which results in low resource utilization of the system and a pending increase in the total throughput of the system.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, the relay-based two-stage cooperative multicast method capable of improving the resource utilization rate and the overall system throughput is provided.
In order to achieve the above object, the present invention provides a relay-based two-stage cooperative multicast method, comprising the steps of:
the first step, the cooperative multicast system includes base station, relay and remote user, the system uses frame as dispatching cycle, and divides each frame into two time slots; the relay is divided into two types, wherein the first type of relay receives data in a first time slot of each frame, and the second time slot forwards the data; the second type of relay is that data is forwarded in the first time slot of each frame, and the data is received in the second time slot;
secondly, the base station continuously broadcasts data in two time slots of each frame;
thirdly, in the first time slot of each frame, the second class of relays forwards the information after interference elimination; the first class relay receives the forwarding information from the second class relay and the information sent by the base station in the current time slot;
fourthly, in a second time slot of each frame, the first-class relay sends information after interference elimination; the second class relay receives the forwarding information from the first class relay and the information sent by the base station in the current time slot;
and fifthly, receiving the information forwarded by the second type of relay by the remote user (the user needing the relay) in the first time slot of each frame, and receiving the information forwarded by the first type of relay in the second time slot of each frame. It should be noted that the remote user cannot correctly receive the information transmitted by the base station, and the signal transmitted by the base station is considered to be a weak interference signal.
The invention provides a new cooperative multicast transmission scheme aiming at the defect that the cooperative multicast can not transmit new data in the second stage on the basis of the two-stage cooperative multicast. In the application scenario of the scheme, the base station still transmits the broadcast data in the second stage after completing the transmission of the broadcast data in the first stage. Meanwhile, aiming at the remote user with poor channel link quality, the data receiving problem of the remote user is solved through a specific new relay transmission strategy.
Preferably, in the second step, in the first time slot of the first frame, the base station only sends the broadcast data of the current time slot; in each of the rest time slots, the signal sent by the base station is a broadcast superimposed signal, and the broadcast superimposed signal includes a broadcast data signal of the current time slot and an anti-phase signal of the broadcast data signal sent by the previous time slot.
Preferably, in the third step, the first type of relay cancels the interference from the second type of relay by using the anti-phase signal in the broadcast superimposed signal transmitted by the base station in the current time slot.
Preferably, in the fourth step, the second type of relay cancels the interference from the first type of relay by using the anti-phase signal in the broadcast superimposed signal transmitted by the base station in the current time slot.
Preferably, it is determined that the system has n-frame scheduling, m remote users, and the remote users are numbered: UE (user Equipment)1,UE2,…,UEmThe data transmission method of the system in two time slots of the nth frame is as follows:
(1) when the system is in the first slot of the nth frame, the operation of each entity in the system is as follows,
A. base station broadcast S2n-1+S2n-2 *Information, wherein S2n-1For new information sent by the base station in the first slot of the nth frame, S2n-2 *For new information transmitted by the base station in the second time slot of the (n-1) th frame, and S2n-2 *＝-S2n-2，S2n-2New information sent for the base station in the second time slot of the (n-1) th frame;
B. the second type relays send information S in the first time slot2n-2；
C. The first type of relay receives information S from the base station in the first time slot2n-1+S2n-2 *While receiving information S from the second class of relays2n-2Then the first kind relays the utilization information S2n-2Cancelling signal S2n-2 *To obtain a signal S2n-1；
D. Remote user UE1,UE2…,UEmReceiving a signal S transmitted by a second type relay in a first time slot2n-2；
(2) When the system is in the second slot of the nth frame, the operation of each entity in the system is as follows,
A. base station broadcast S2n+S2n-1 *Information, wherein S2nFor new information transmitted by the base station in the second time slot of the nth frame, S2n-1 *For new information sent by the base station in the first time slot of the nth frame, and S2n-1 *＝-S2n-1，S2n-1New information sent for the base station in the first time slot of the nth frame;
B. first relay sends information S in second time slot2n-1；
C. The second type of relay receives information S from the base station in the second time slot2n+S2n-1 *Simultaneously receiving information S from the first type of relay2n-1Then the second class relays the utilization information S2n-1Cancelling signal S2n-1 *To obtain a signal S2n；
D. Remote user UE1,UE2…,UEmReceiving the signal S sent by the first relay in the second time slot2n-1。
The invention has the advantages of effectively improving the efficiency of two-stage cooperative multicast, improving the resource utilization rate, improving the overall throughput of the system and ensuring the improvement of the throughput of the remote user with poor channel quality.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a two-stage cooperative multicast model in the present invention.
Fig. 2 is a schematic diagram of a model for transmitting remote users by two types of relays in the present invention.
Fig. 3 is a model diagram of a relay-based two-stage cooperative multicast design scheme in the present invention.
Fig. 4 is a schematic diagram of a three-sector cell cooperative multicast model in the present invention.
Fig. 5 is a diagram illustrating the remote user data reception result of two-stage cooperative multicast in three frame periods according to the present invention.
Detailed Description
Example 1
A two-stage cooperative multicast scenario is defined, as shown in fig. 2, where there are m remote users, and the remote users are numbered: UE (user Equipment)1,UE2,…,UEm. The remote user must alternatively relay the broadcast information transmitted by the base station through two fixed relays (i.e. the first type of relay FR1 and the second type of relay FR2), and the remote user regards the signal transmitted by the base station as a weak interference signal.
Assuming that the base station continuously broadcasts data in the three-sector cell, as shown in fig. 3, each frame period is divided into two time slots TS1 and TS2, and the data transmission performed by the base station is shown in table 1, SiIs a data signal transmitted at a unit power, i ═ 1,2, K,2n-2,2n-1,2n]。
TABLE 1
Table 1 indicates the anti-phase signal.
Unlike other schemes, the channel quality between the first type of relay FR1 and the base station BS and between the second type of relay FR2 and the base station BS are not affected by MSs (mobile side), and in actual processing, a channel quality threshold is set as the probability of successful reception and forwarding of data of the relays FR1 and FR 2. The two kinds of relays are respectively and correspondingly expressed as FR1[ FR ] of the first kind1,fr2,K,frn]And a second class FR2[ FR1,FR2,K,FRn]And the two types of relays correspond to different data transceiving states. The corresponding transmission/reception states of the relays FR1 and FR2 are shown in table 2.
TABLE 2
The underlining in the table represents the transmitted data and the rest the received data, (I) the interfering signal. In addition, the second type relay FR2 in table 2 is in the 2 nd frame F2The first time slot TS1 in (a) sends the information S2(ii) a FR1 at frame 2F2The second time slot TS2 in (a) sends the information S3(ii) a First type relay FR1 at frame 2F2The first time slot TS1 in receives S from the base station3+S2 *Information and information S forwarded from a second type of relay FR22FR1 utilizes S from a base station2 *Information S sent by information elimination FR22To obtain information S3(ii) a Second type of relay FR2 in frame 2F2The second time slot TS2 in (a) receives S from the base station4+S3 *Information and information S sent from first class relay FR13FR2 utilizes S from a base station3 *Information S sent by information elimination FR13To obtain S4And (4) information.
MSs in the cell are divided into SMSs (successful mobile terminals) and UMSs (unsuccessful mobile terminals) according to the data receiving conditions, and remote user UE (user equipment) with poor channel link quality in the UMSs1,…,UEmThe broadcast information transmitted by the base station must be alternately relayed through fixed relays FR1 and FR 2. The remote user receives the forwarded data from the two types of relays, and the remote user UE considers the signal sent by the base station as a weak interference signalk，k＝[1,2,K,m]The data reception state of (2) is as described in table 3.
TABLE 3
The behaviors of BS, FR1 and FR2 in the table are transmitted as data signals, and UEkThe action data signal is received, where the underline represents a weak interfering signal.
Example 2
In this embodiment, taking a three-sector cell as an example, fig. 4 is a schematic diagram of a cooperative multicast model of a first time slot, a second time slot in a first frame, and a first time slot in a second frame. In fig. 4, solid arrows represent transmission of useful signals, and dashed arrows represent transmission of interference signals.
The system has n frame scheduling, and the frames are labeled: f1，F2，…，Fn. Setting the base station to continue high-rate broadcast in two time slots of each frame, taking one of the sectors of the cell as an example, fr in the sector1And FR1Is two fixed relays, and fr1∈FR1,FR1E.g. FR 2. Relay fr1And FR1And receiving data and forwarding multicast data in corresponding time slots. fr1And between base stations and FR1The channel link condition with the base station is good, and
and satisfy
And
and satisfy
Wherein sigma,
Are all fixed thresholds. The cell contains L multicast groups in total, in multicast group GlIn (1, 2, L), UE1Is a remote user with a poor channel link quality. Hi1、Hi2For the purpose of the channel gain set,
in order to achieve small-scale fading, the system is,
subject to the rayleigh distribution at unit power.
With remote user UE1For example, the signal reception condition will be described.
Enter F1-TS1 stage: remote user UE1Fails to successfully receive the broadcast data of the base station BS and thus acts as a marginal UMS (unsuccessfully mobile end), when the relay fr1Successfully receiving a data signal S transmitted by a base station BS1S is marked by a solid thick arrow1。
Enter F1-TS2 stage: remote user UE1Received from relay fr1Forwarded data signal S1And signals S transmitted by the base station BS2+S1 *In FIG. 4, the BS-to-UE is marked by a thin dashed arrow1Signal S of2+S1 *At this time, the UE1Will S2+S1 *As weak interference signal and removed, only receiving S1A data signal. At the same time, relaying FR1Will receive a data signal S from the base station BS2+S1 *And relay fr1Transmitted interference signal S1The signal S is marked by a thick arrow with a broken line1Due to S1 *Is an anti-phase signal, and therefore by repeating FR in1Performing signal superposition processing, and completing decoding and encoded relay FR1Only the signal S2As a data signal to be transmitted in the next stage.
Enter F2-TS1 stage: remote user UE1Receiving from a Relay FR1Forwarded data signal S2And signals S transmitted by the base station BS3+S2 *At this time, the UE1Will S3+S2 *As weak interference signal and removed, only receiving S2A data signal. At the same time, relay fr1Will receive a data signal S from the base station BS3+S2 *And relay FR1Transmitted interference signal S2The signal S is marked by a thick arrow with a broken line2Since the signal transmitted by the base station BS also contains S2Is opposite phase signal S2 *Thus in relay fr1Only the signal S is added after the signals are added and the decoding and the encoding are finished3As a transmission signal of the next stage.
Enter F2-TS2 stage: the data signal processing flow is similar to F1-TS2 stage. In the two-stage cooperative multicast of each frame, the TS1 stage process is similar, the TS2 stage process is similar, and the cooperative multicast of two time slots of each frame is completed in turn.
In addition, FIG. 5 illustrates a two-stage cooperative multicast over three frame periods for remote user UEs1The data reception result of (1). Removing remote user UE1After receiving the weak interference signal component in the signal, the UE1The received data signal is the desired broadcast data content in the previous time slot.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A relay-based two-stage cooperative multicast method is characterized by comprising the following steps:
the first step, the cooperative multicast system includes base station, relay and remote user, the system uses frame as dispatching cycle, and divides each frame into two time slots; the relay is divided into two types, wherein the first type of relay receives data in a first time slot of each frame, and the second time slot forwards the data; the second type of relay is that data is forwarded in the first time slot of each frame, and the data is received in the second time slot;
secondly, the base station continuously broadcasts data in two time slots of each frame;
thirdly, in the first time slot of each frame, the second class of relays forwards the information after interference elimination; the first class relay receives the information which is forwarded by the second class relay and is subjected to interference elimination and the information which is sent by the base station at the current time slot;
fourthly, in a second time slot of each frame, the first-class relay sends information after interference elimination; the second class relay receives the information which is forwarded by the first class relay and is subjected to interference elimination and the information which is sent by the base station in the current time slot;
and fifthly, the remote user receives the information which is forwarded by the second type of relay and is subjected to interference elimination in the first time slot of each frame, and receives the information which is forwarded by the first type of relay and is subjected to interference elimination in the second time slot of each frame.
2. The relay-based two-stage cooperative multicast method according to claim 1, wherein: in the second step, in the first time slot of the first frame, the base station only sends the broadcast data of the current time slot; in each of the rest time slots, the signal sent by the base station is a broadcast superimposed signal, and the broadcast superimposed signal includes a broadcast data signal of the current time slot and an anti-phase signal of the broadcast data signal sent by the previous time slot.
3. The relay-based two-stage cooperative multicast method according to claim 1, wherein: in the third step, the first type of relay eliminates the interference from the second type of relay by using the anti-phase signal in the broadcast superposed signal transmitted by the base station in the current time slot.
4. The relay-based two-stage cooperative multicast method according to claim 1, wherein: in the fourth step, the second class relay eliminates the interference from the first class relay by using the anti-phase signal in the broadcast superposed signal transmitted by the base station in the current time slot.
5. The relay-based two-stage cooperative multicast method according to claim 1, wherein it is determined that the system has n frames for scheduling, and the data transmission method of the system in two slots of the nth frame is:
(1) when the system is in the first slot of the nth frame, the operation of each entity in the system is as follows,
A. base station broadcast S2n-1+S2n-2 *Information, wherein S2n-1For new information sent by the base station in the first slot of the nth frame, S2n-2 *For new information transmitted by the base station in the second time slot of the (n-1) th frame, and S2n-2 *= -S2n-2，S2n-2New information sent for the base station in the second time slot of the (n-1) th frame;
B. the second type relays send information S in the first time slot2n-2；
C. The first type of relay receives information S from the base station in the first time slot2n-1+S2n-2 *While receiving information S from the second class of relays2n-2Then the first kind relays the utilization information S2n-2Cancelling signal S2n-2 *To obtain a signal S2n-1；
D. The remote user receives the signal S transmitted by the second type relay in the first time slot2n-2；
(2) When the system is in the second slot of the nth frame, the operation of each entity in the system is as follows,
A. base station broadcast S2n+S2n-1 *Information, wherein S2nFor new information transmitted by the base station in the second time slot of the nth frame, S2n-1 *For new information sent by the base station in the first time slot of the nth frame, and S2n-1 *= -S2n-1，S2n-1New information sent for the base station in the first time slot of the nth frame;
B. first relay sends information S in second time slot2n-1；
C. The second type of relay receives information S from the base station in the second time slot2n+S2n-1 *Simultaneously receiving information S from the first type of relay2n-1Then the second class relays the utilization information S2n-1Cancelling signal S2n-1 *To obtain a signal S2n；
D. The remote user receives the signal S transmitted by the first relay in the second time slot2n-1。
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