CN102111208B - System and method for receiving system information for first class relay station - Google Patents

Abstract

The invention provides a system and method for receiving system information for the first class relay station. The method comprises the following steps: delaying or bringing forward access link downlink radio frames relative to direct link downlink radio frames, so that the first relay station on an access link is configured on a part of or all relay sub frames of multicast broadcast single frequency network (MBSFN) sub frames and receives synchronous signals and/or broadcast messages sent from a base station on the direct link. By using the technical scheme, the first class relay station can directly receive physical broadcast channel (PBCH) and/or the synchronizing signals from the base station on the direct link, thus reducing the overhead and the complexity, so that the base station is in no need of specially transmitting broadcast messages and/or synchronizing signals which are repeated with those of the direct link to the first class relay station again on a Backhaul link.

Description

A kind of system and method for first class relay station receiving system information

Technical field

The invention belongs to moving communicating field, refer more particularly to a kind of system and method for first class relay station receiving system information.

Background technology

Relaying technique as a kind of emerging technology, has caused more and more widely and has noted, has been regarded as the key technology of B3G/4G.Due to future wireless system or cellular system requirement increase coverage, support higher rate transmission, this has proposed new challenge to wireless communication technology.Meanwhile, the cost issues of system building and maintenance is more outstanding.Along with the increase of transmission rate and communication distance, it is outstanding that the energy consumption issues of battery also becomes, and following radio communication will adopt higher frequency, and the pathloss attenuation causing is thus more serious.By relaying technique, traditional one hop link can be divided into a plurality of multi-hop links, due to Distance Shortened, this will greatly reduce path loss, contribute to improve transmission quality, expand communication range, thereby provide quicker better service for user.

In junction network, user and the link between relay station that relay station participates in service are called as access link (Access Link), link between relay station and base station is called as back haul link (Backhaul Link), and user and the link between base station that base station participates in service are called as the link that direct transfers (Direct Link).As shown in Figure 1.

At present in 3GPP(3rd Generation Partnership Project, third generation partner program) in Release9 release criteria TR36.814_132, relay station is divided into two classes: first class relay station and second-class relay station.

First class relay station is relay station in a kind of band, and it comprises following characteristics:

First class relay station can be managed community, and In the view of user, separate between its Yu Yuan community, community of managing;

The community that first class relay station is managed has independently Physical Cell Identifier (Physical Cell ID), and first class relay station will send himself synchronizing channel and reference symbol;

The in the situation that of single cell operation, user will directly receive schedule information and HARQ feedback from first class relay station, and transmits control channel to first class relay station;

In the view of the user of Rel-8 version, a first class relay station is exactly the base station of a Rel-8 version;

In the view of the user of LTE-A, first class relay station may be different with the base station of Rel-8 version, to treat further research.

For relay station in band, back haul link and access link are operated on identical frequency band.Generally, in band, relay station is in the transmission receiving from base station, if relay station is also being launched to user in band, can make, with producing and disturb between the transmitting terminal of interior relay station self and receiving terminal, can cause like this severe exacerbation of communication quality.

The method of common employing configuration relaying time slot (gaps) solves the problem of above-mentioned interference at present, on descending sub frame, configure some time slots, be called relaying time slot, continue in these on time slot, first class relay station is from base station received signal, and not to user's transmitted signal, to avoid occurring the interference between self transmitting terminal and receiving terminal at first class relay station.The subframe at these relaying time slot places is called as relay sub-frame.

Therefore, system need to be carried out the configuration of relaying time slot and the configuration information of the relay sub-frame position at relaying time slot place is notified to user, allows user not receive the signal from relay station on the relaying time slot of this relay sub-frame.

At present at LTE-Advanced(Long Term Evolution Advanced) in network, there is a kind of MBSFN(Multicast Broadcast Single Frequency Network, multimedia multicast Single Frequency Network) subframe, the user of Rel-8 version is only at front 1 or 2 OFDM(Orthogonal Frequency Division Multiplexing of this MBSFN subframe, OFDM) on symbol, receive, and do not receive on other OFDM symbol.Therefore, for the consideration to the compatible of Rel-8 version user and minimizing expense, LTE-Advanced system is a MBSFN subframe by the relay sub-frame configuration at relaying time slot place on Access link, like this, time slot in this MBSFN subframe except front 1 or 2 symbol has just formed needed relaying time slot, and system can notify user to be somebody's turn to do the configuration information for the MBSFN subframe position of relay transmission by broadcast message.

According to said method, in being configured to the relay sub-frame of MBSFN subframe, first class relay station can be on the non-MBSFN symbol of this subframe (front 1 or 2 symbol in subframe) to user's transmitted signal, and using MBSFN symbol as relaying time slot, on relaying time slot, receive from the signal of base station and not to user's transmitted signal, between first class relay station self transmitting terminal and receiving terminal, produce and disturb avoiding.As shown in Figure 2.

In LTE and LTE-A FDD system, the least unit of time span is defined as T _s=130720 milliseconds.Descending wireless transmission is carried out in downlink radio frame, and the length of a downlink radio frame (Radio Frame) is T _f=307200T _s=10 milliseconds; Each downlink radio frame comprises 20 time slots (slot), and the length of each time slot is T _slot=15360T _s=0.5 millisecond; Two continuous time slots form a subframe (Subframe), and the time span of each subframe is 1 millisecond.

At subcarrier spacing, be in 15KHz situation, each slot in downlink radio frame comprises 7 or 6 OFDM symbols, and the length of each OFDM symbol own is 2048T _s.In order to reduce intersymbol interference, need in each OFDM symbol time domain, add CP(cyclic prefix, Cyclic Prefix), CP is divided into common CP (Normal cyclic prefix) and expansion CP(Extended cyclic prefix), be specially:

(1) in adopting the slot of common CP, generally there are 7 OFDM symbols, for No. 0 OFDM symbol, its common CP length T _nCP=160T _s, for No. 1 to No. 6 OFDM symbol, its common CP length T _nCP=144T _s;

(2) in adopting the slot of expansion CP, generally there are 6 OFDM symbols, for No. 0 to No. 5 OFDM symbol, its expansion CP length T _eCP=512T _s.

In this article, OFDM symbol itself is done to as a whole treating with its CP adding, be referred to as OFDM symbol, different according to the length of CP, the length of OFDM symbol is also different, adopts No. 0 OFDM symbol lengths T of common CP _oFDM=(160+2048) T _s=2208T _s, for No. 1 to No. 6 OFDM symbol that adopts common CP, its length is T _oFDM=(144+2048) T _s=2192T _s, adopting the OFDM symbol lengths of expansion CP is T _oFDM=(512+2048) T _s=2560T _s, as Fig. 3.

According to the protocol specification of LTE/LTE-A, PSS(Primary synchronization signal can be launched in base station on last OFDM symbol of slot0 and 10, master sync signal), on the penultimate OFDM of slot0 and 10 symbol, launch SSS(Secondary synchronization signal, auxiliary synchronous signals), and launch PBCH(Physical broadcast channel, Physical Broadcast Channel on front 4 OFDM symbols of slot1), as shown in Figure 4.

On Direct link, base station sends PSS, SSS and in subframe 0, sends PBCH on subframe 0 and 5 carries out according to predetermined transmitting rule, and receiving terminal just can directly receive without obtaining PDCCH.For the first class relay station that cannot receive Direct link PDCCH, if can directly monitor PSS, SSS and PBCH on Direct link, can reduce expense and complexity, make base station without send again to first class relay station broadcast and the synchronizing signal sending on Direct link specially on Backhaul link.

But the protocol specification current according to 3GPP, on Access link, in radio frames 0, 4, 5, 9 subframes cannot be configured to MBSFN subframe, be that these subframes can not become relay sub-frame, in these subframes, first class relay station can not carry out from base station descending reception, once the subframe 0 of Direct link or 5 and Access link 0, 4, 5, certain subframe in 9 occurs simultaneously, generally now first class relay station just cannot directly receive the PSS on Direct link, SSS and/or PBCH, to such an extent as to need on other Radio Resource, carry out the reception of synchronous and/or system broadcast information, cause the waste of resource and unnecessary time delay, as shown in Figure 5.

Symbol described in the present invention, all refers to OFDM symbol; Described length, all refers to the length in time domain.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of system and method for first class relay station receiving system information, has solved first class relay station in prior art and cannot on Direct link, directly receive broadcast that base station issues and/or the technical problem of synchronizing signal.

In order to address the above problem, the invention provides a kind of method of first class relay station receiving system information, comprise: will access (Access) link downlink radio frame and relatively direct transfer that (Direct) link downlink radio frame is postponed or in advance, make first class relay station from Direct link, receive synchronizing signal and/or the broadcast that base station issues in the part or all of relay sub-frame that is configured to multimedia multicast Single Frequency Network (MBSFN) subframe of described Access link.

Further, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed or 5n+m subframe in advance;

The value of described n is integer; The value of described m is 2 or 3 or 4;

When the value of 5n+m represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance when negative;

When the value of 5n+m is that timing represents that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed or k OFDM symbol in advance;

For the Access link of common CP, the value of described k is-7≤k≤6;

For the Access link of expansion CP, the value of described k is-6≤k≤5;

When getting negative value, k represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

When k get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed or Δ T in advance ₃, described Δ T ₃value for from the descending size that receives the protection interval that downlink or the conversion from downlink to descending reception arrange;

As described Δ T ₃while getting negative value, represent that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

As described Δ T ₃get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, the descending propagation delay of establishing back haul link is T _t, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed to T _t.

Further, the descending propagation delay of establishing back haul link is T _t, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed to T _t.

Further, the value of described n is-2 or-1 or 0 or 1.

The present invention also provides a kind of system of first class relay station receiving system information, comprises module and first class relay station are set;

The described module that arranges, for access (Access) link downlink radio frame, relatively direct transfer that (Direct) link downlink radio frame is postponed or shift to an earlier date, the arbitrary descending sub frame that is configured to multimedia multicast Single Frequency Network (MBSFN) subframe that makes the subframe of described Direct link transmission synchronizing signal and/or broadcast and described Access link all or part of overlapping in time domain;

Described first class relay station, for be configured to all or part of relay sub-frame of MBSFN subframe at described Access link descending sub frame, receives from Direct link synchronizing signal and/or the broadcast that base station issues.

Further, describedly arrange that module is postponed the relative Direct link of described Access link downlink radio frame downlink radio frame or 5n+m subframe in advance;

The value of described n is integer; The value of described m is 2 or 3 or 4;

When the value of 5n+m represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance when negative;

When the value of 5n+m is that timing represents that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, describedly arrange that module is also postponed the relative Direct link of described Access link downlink radio frame downlink radio frame or k OFDM symbol in advance;

For the Access link of common CP, the value of described k is-7≤k≤6;

For the Access link of expansion CP, the value of described k is-6≤k≤5;

When getting negative value, k represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

When k get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, describedly arrange that module is also postponed the relative Direct link of described Access link downlink radio frame downlink radio frame or Δ T in advance ₃, described Δ T ₃value for from the descending size that receives the protection interval that downlink or the conversion from downlink to descending reception arrange;

As described Δ T ₃while getting negative value, represent that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

As described Δ T ₃get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, the descending propagation delay of establishing back haul link is Tt, and the described module that arranges is also postponed Tt by the relative Direct link of described Access link downlink radio frame downlink radio frame.

Further, the descending propagation delay of establishing back haul link is Tt, and the described module that arranges is also postponed Tt by the relative Direct link of described Access link downlink radio frame downlink radio frame.

Further, the described module that arranges is positioned at base station or first class relay station or gateway.

Further, describedly arrange that module is postponed the relative Direct link of Access link downlink radio frame downlink radio frame or in advance, make described Direct link send descending sub frame all or part of overlapping the referring in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link:

Module is set first postpones the relative Direct link of Access link downlink radio frame downlink radio frame or shifts to an earlier date, make described Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link, afterwards on Access link with the overlapping descending sub frame of the subframe of described transmission synchronizing signal and/or broadcast in part or all of subframe be set to MBSFN subframe; Or,

Module is set MBSFN subframe is first set on Access link, afterwards the relative Direct link of Access link downlink radio frame downlink radio frame is postponed or in advance, make described Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link.

In sum, the invention provides a kind of system and method for first class relay station receiving system information, by the subframe of Direct link 0 and 5 and Access link on subframe 0,4,5,9 stagger, and by finer adjustment, make first class relay station directly from Direct link, receive PBCH and/or the synchronizing signal (comprising PSS and SSS) from base station, reduce expense and complexity, make base station without on Backhaul link specially to first class relay station send again with Direct link on the broadcast and/or the synchronizing signal that repeat.

Accompanying drawing explanation

Fig. 1 is junction network structural representation;

Fig. 2 is relay sub-frame structure and the working method schematic diagram that is configured to MBSFN subframe;

Fig. 3 is Slot structural representation;

Fig. 4 is wireless frame structure and PSS, SSS and PBCH structural representation;

Fig. 5 is the Direct link schematic diagram that conflicts with Access link;

Fig. 6 is that the inventive method is carried out downlink frame schematic diagram regularly;

Fig. 7 is that application example 1 of the present invention carries out downlink frame timing method schematic diagram;

Fig. 8 is that application example 2 of the present invention carries out downlink frame timing method schematic diagram;

Fig. 9 application example 3 of the present invention carries out downlink frame timing method schematic diagram;

Figure 10 application example 4 of the present invention carries out downlink frame timing method schematic diagram.

Embodiment

The invention provides the system and method for first class relay station receiving system information, make first class relay station can directly receive PBCH and/or PSS, the SSS from base station, reduce expense and complexity, make base station without send again broadcast and/or the synchronizing signal identical with Direct link to first class relay station specially on Backhaul link.

The system of a kind of first class relay station receiving system information that the present embodiment provides, comprises base station, module and first class relay station is set;

Module is set, for the relative Direct link of Access link downlink radio frame downlink radio frame being postponed or in advance, make Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of Access link;

First class relay station, for all or part of relay sub-frame that is set to MBSFN subframe at described Access link, receives from Direct link synchronizing signal and/or the broadcast that base station issues.

It can be to be positioned at base station that module is set, and can be to be also positioned at gateway or first class relay station etc.Above-mentioned synchronizing signal comprises PSS and SSS.

Arrange that module can be postponed the relative Direct link of Access link downlink radio frame downlink radio frame in the following ways or in advance:

(1) adopt subframe timing, module be set by the postponement of the relative Direct link of described Access link downlink radio frame downlink radio frame or shift to an earlier date 5n+m subframe;

The value of n is integer; The value of m is 2 or 3 or 4;

When the value of 5n+m represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance when negative;

When the value of 5n+m is that timing represents that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

(2) symbolization regularly, arranges module by the postponement of the relative Direct link of Access link downlink radio frame downlink radio frame or shifts to an earlier date k OFDM symbol;

For the Access link of common CP, the value of k is-7≤k≤6;

For the Access link of expansion CP, the value of k is-6≤k≤5;

When getting negative value, k represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

When k get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

(3) fixed delay regularly, arranges module by the postponement of the relative Direct link of Access link downlink radio frame downlink radio frame or shifts to an earlier date Δ T ₃, Δ T ₃value for from the descending size that receives the protection interval that downlink or the conversion from downlink to descending reception arrange;

As Δ T ₃while getting negative value, represent that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

As Δ T ₃get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

(4) regularly, the descending propagation delay of establishing Backhaul link is T to propagation delay _t, module is set the relative Direct link of Access link downlink radio frame downlink radio frame is postponed to T _t.

Arrange that module is postponed Access link downlink radio frame or can be by mode (1) and any one or the multiple use that combines in mode (2), (3) and (4) in advance time.

Arrange that module is postponed the relative Direct link of Access link downlink radio frame downlink radio frame or in advance, making descending sub frame all or part of that Direct link sends synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of Access link overlapping in time domain can be any in following mode:

(a) module being set first postpones the relative Direct link of Access link downlink radio frame downlink radio frame or shifts to an earlier date, make described Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link, afterwards on Access link with the overlapping descending sub frame of the subframe of described transmission synchronizing signal and/or broadcast in part or all of subframe be set to MBSFN subframe;

(b) module is set MBSFN subframe is first set on Access link, afterwards the relative Direct link of Access link downlink radio frame downlink radio frame is postponed or in advance, make Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link.

The method of a kind of first class relay station receiving system information that the present embodiment provides, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed or shifted to an earlier date, make first class relay station in all or part of relay sub-frame that is set to MBSFN subframe of Access link, from Direct link, receive synchronizing signal and/or the broadcast that base station issues.

Above-mentioned synchronizing signal comprises PSS and SSS.

The relative Direct link of Access link downlink radio frame downlink radio frame is postponed or the mode that shifts to an earlier date can be, to Access link downlink radio frame carry out subframe timing, Symbol Timing, fixed delay regularly and propagation delay regularly;

Below several timing modes are specifically described:

(1) subframe timing, is about to the postponement of the relative Direct link of Access link downlink radio frame downlink radio frame or shifts to an earlier date 5n+m subframe;

N is integer, m ∈ { 2,3,4}.With respect to the starting point time-domain position of Direct link downlink radio frame, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₁＝(5n+m)×30720·T _s，m∈{2,3,4}

N is integer, represents that the relative Direct link of time-domain position downlink radio frame in advance when 5n+m gets negative value.

Preferably, the value of n is-2 or-1 or 0 or 1.

(2) Symbol Timing, is about to the relative Direct link of Access link downlink radio frame downlink radio frame and postpones or shift to an earlier date k OFDM symbol, and k is integer;

While adopting common CP, the starting point of Access link downlink radio frame is postponed to 0 to 6 OFDM symbol, or shift to an earlier date 0 to 7 OFDM symbol, the starting point time domain side-play amount of Access link downlink radio frame is

${\mathrm{\ΔT}}_2=\left\{\begin{array}{c}-[2208+\left(\right|k|-1)\·2192]\·T_s,-7\≤k\≤-1\\ 0,k=0\\ k\·\left(2192\right)\·T_s,1\≤k\≤6\end{array}\right.$

When getting negative value, k represents that the relative Direct link downlink radio frame of time domain position in advance;

While adopting expansion CP, the starting point of Access link downlink radio frame is postponed to 0 to 5 OFDM symbol, or shift to an earlier date 0 to 6 OFDM symbol, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₂＝k·2560·T _s,-6≤k≤5

When getting negative value, k represents that the relative Direct link of time-domain position downlink radio frame in advance.

Preferably, k=0.

(3) fixed delay regularly, is the time domain length T that first class relay station carries out the protection interval 1 that the conversion from downlink to descending reception arranges according to system _gP1and/or system is the time domain length T that first class relay station carries out the protection interval 2 that arranges from the descending conversion that receives downlink _gP2, the starting point of Access link downlink radio frame is postponed, shifted to an earlier date or remain unchanged, the starting point time domain side-play amount of Access link downlink radio frame is

Δ T ₃=-T _gP1or T _gP2or 0

Δ T ₃while getting negative value, represent that time-domain position in advance.

Preferably, Δ T ₃=T _gP2or 0.

(4) propagation delay timing, according to the descending propagation delay T of Backhaul link _t, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₄＝T _t

Based on aforesaid way (1), (2), (3) and (4), according to subframe timing, Symbol Timing, fixed delay timing and propagation delay regularly, the starting point time-domain position tAS of Access link downlink radio frame is set as

t _AS＝t _DS+ΔT ₁+ΔT ₂+ΔT ₃+ΔT ₄

T _dSstarting point time-domain position for Direct link downlink radio frame.

Aforesaid way (1) can with any one or the multiple use that combines in mode (2), (3) and (4).

Application example 1

In a first class relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _dS, Access link adopts common CP, and system is the duration T that first class relay station carries out the protection interval 2 that arranges from the descending conversion that receives downlink _gP2=1096T _s, the propagation delay T on Backhaul link _t=307T _s, the detailed process of carrying out frame timing for Access link downlink radio frame is:

(1) subframe timing, the starting point of setting Access link downlink radio frame is 3 subframes of starting point postponement with respect to Direct link downlink radio frame, be n=0, m=3, with respect to the starting point time-domain position of Direct link downlink radio frame, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₁＝(5n+m)×307200·T _s＝(5×0+3)×30720·T _s＝92160·T _s

(2) Symbol Timing, postpones 1 OFDM symbol by the starting point of Access link downlink radio frame, i.e. k=1, because Access link adopts common CP, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₂＝k·(2192)·T _s＝2192·T _s

(3) fixed delay regularly, is the time domain length T that first class relay station carries out the protection interval 2 that arranges from the descending conversion that receives downlink according to system _gP2, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed to T _gP2, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₃＝T _GP2＝1096·T _s

(4) propagation delay timing, according to the descending propagation delay T of Backhaul link _t, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed to T _t, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₄＝T _t＝307·T _s

Based on aforesaid way (1), (2), (3) and (4), according to subframe timing, Symbol Timing, fixed delay timing and propagation delay regularly, by the starting point time-domain position t of Access link downlink radio frame _aSbe set as

$\begin{array}{c}{t}_{\mathrm{AS}}=t_{\mathrm{DS}}+{\mathrm{\ΔT}}_1+{\mathrm{\ΔT}}_2+{\mathrm{\ΔT}}_3+{\mathrm{\ΔT}}_4\\ =t_{\mathrm{DS}}+92160\·T_s+2192\·T_s+1096\·T_s+307\·T_s\\ =t_{\mathrm{DS}}+95755\·T_s\end{array}$

The starting point time-domain position that represents Access link downlink radio frame is postponed 95755T than the starting point of Direct link downlink radio frame _s, as shown in Figure 7, if Access subframe 7 and 2 is configured to MBMS subframe as relay sub-frame, first class relay station can directly receive PSS, SSS and the PBCH on Direct link on Access subframe 7 and 2.

Application example 2

In a first class relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _dS, Access link adopts common CP, and system is the duration T that first class relay station carries out the protection interval 2 that arranges from the descending conversion that receives downlink _gP2=1096T _s, the propagation delay T on Backhaul link _t=307T _s, the detailed process of carrying out frame timing for Access link downlink radio frame is:

(1) subframe timing, the starting point of setting Access link downlink radio frame is 1 subframe in advance of the starting point with respect to Direct link downlink radio frame, be n=-1, m=4, with respect to the starting point time-domain position of Direct link downlink radio frame, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₁＝(5n+m)×30720·T _s＝-30720·T _s

(2) Symbol Timing, postpones 5 OFDM symbols by the starting point of Access link downlink radio frame, i.e. k=5, because Access link adopts common CP, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₂＝k·(2192)·T _s＝10960·T _s

(3) fixed delay regularly, is the time domain length T that first class relay station carries out the protection interval 2 that arranges from the descending conversion that receives downlink according to system _gP2, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed to T _gP2, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₃＝T _GP2＝1096·T _s

(4) propagation delay timing, according to the descending propagation delay T of Backhaul link _t, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₄＝T _t＝307·T _s

Based on mode (1) (2) (3) and (4), according to subframe timing, Symbol Timing, fixed delay timing and propagation delay regularly, by the starting point time-domain position t of Access link downlink radio frame _aSbe set as

$\begin{array}{c}{t}_{\mathrm{AS}}=t_{\mathrm{DS}}+{\mathrm{\ΔT}}_1+{\mathrm{\ΔT}}_2+{\mathrm{\ΔT}}_3+{\mathrm{\ΔT}}_4\\ =t_{\mathrm{DS}}-30720\·T_s+10960\·T_s+1096\·T_s+307\·T_s\\ =t_{\mathrm{DS}}-18357\·T_s\end{array}$

The starting point time-domain position that represents Access link downlink radio frame shifts to an earlier date 18357T than the starting point of Direct link downlink radio frame _s, as shown in Figure 8, if Access subframe 1 is configured to MBMS subframe as relay sub-frame, now first class relay station can directly receive the PBCH on Direct link in Access subframe 1.

In this embodiment, base station need to not resend and broadcast identical on Direct link on Backhaul link.

Application example 3

In a first class relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _dS, Access link adopts common CP, and system is the duration T that first class relay station carries out the protection interval 1 that the conversion from downlink to descending reception arranges _gP1=1096T _s, the propagation delay T on Backhaul link _t=522T _s, the detailed process of carrying out frame timing for Access link downlink radio frame is:

(1) subframe timing, the starting point of setting Access link downlink radio frame is 2 subframes of starting point postponement with respect to Direct link downlink radio frame, be n=0, m=2, with respect to the starting point time-domain position of Direct link downlink radio frame, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₁＝(5n+m)×30720·T _s＝61440·T _s

(2) Symbol Timing, by the starting point of Access link downlink radio frame 6 OFDM symbols in advance, i.e. k=-6, because Access link adopts common CP, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₂＝-[2208+(|k|-1)×2192]×T _s＝-13168·T _s

(3) fixed delay regularly, is the time domain length T that first class relay station carries out the protection interval 1 that the conversion from downlink to descending reception arranges according to system _gP1, the relative Direct link of Access link downlink radio frame downlink radio frame is shifted to an earlier date to T _gP1, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₃＝-T _GP1＝-1096·T _s

(4) propagation delay timing, according to the descending propagation delay T of Backhaul link _t, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₄＝T _t＝522·T _s

Based on aforesaid way (1) (2) (3) and (4), according to subframe timing, Symbol Timing, fixed delay timing and propagation delay regularly, by the starting point time-domain position t of Access link downlink radio frame _aSbe set as

$\begin{array}{c}{t}_{\mathrm{AS}}=t_{\mathrm{DS}}+{\mathrm{\ΔT}}_1+{\mathrm{\ΔT}}_2+{\mathrm{\ΔT}}_3+{\mathrm{\ΔT}}_4\\ =t_{\mathrm{DS}}+61440\·T_s-13168\·T_s-1096\·T_s+522\·T_s\\ =t_{\mathrm{DS}}+47698\·T_s\end{array}$

The starting point time-domain position that represents Access link downlink radio frame is postponed 47698T than the starting point of Direct link downlink radio frame _s, as shown in Figure 9, if the subframe 8 of Access link is configured to MBMS subframe as relay sub-frame, now first class relay station can directly receive PSS and the SSS on Direct link in the subframe 8 of Access link.

Application example 4

In a first class relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _dS, Access link adopts common CP, and system is the duration T that first class relay station carries out the protection interval 1 that arranges from the descending conversion that receives downlink _gP1=1096T _s, the propagation delay T on Backhaul link _t=307T _s, the detailed process of carrying out frame timing for Access link downlink radio frame is:

(1) subframe timing, the starting point of setting Access link downlink radio frame is, starting point with respect to Direct link downlink radio frame shifts to an earlier date 2 subframes, be n=-1, m=3, with respect to the starting point time-domain position of Direct link downlink radio frame, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT1＝(5n+m)×30720·T _s＝-61440·T _s

(2) Symbol Timing, remains unchanged the starting point time-domain position of Access link downlink radio frame, i.e. k=0, and the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₂＝0

(3) fixed delay regularly, is the time domain length T that first class relay station carries out the protection interval 2 that arranges from the descending conversion that receives downlink according to system _gP2, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed to T _gP2, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₃＝T _GP2＝1096·T _s

(4) propagation delay timing, according to the descending propagation delay T of Backhaul link _t, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed, the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₄＝T _t＝307·T _s

Based on aforesaid way (1) (2) (3) and (4), according to subframe timing, Symbol Timing, fixed delay timing and propagation delay regularly, by the starting point time-domain position t of Access link downlink radio frame _aSbe set as

$\begin{array}{c}{t}_{\mathrm{AS}}=t_{\mathrm{DS}}+{\mathrm{\ΔT}}_1+{\mathrm{\ΔT}}_2+{\mathrm{\ΔT}}_3+{\mathrm{\ΔT}}_4\\ =t_{\mathrm{DS}}-61440\·T_s+0+1096\·T_s+307\·T_s\\ =t_{\mathrm{DS}}-60037\·T_s\end{array}$

The starting point time-domain position that represents Access link downlink radio frame shifts to an earlier date 60037T than the starting point of Direct link downlink radio frame _s, as shown in figure 10, if Access subframe 2 and 7 is configured to MBMS subframe as relay sub-frame, now first class relay station can directly receive PSS, SSS and the PBCH on Direct link in Access subframe 2 and subframe 7.

Above summary of the invention is the unrestricted technological thought of the present invention in order to explanation only, does not depart from any modification or partial replacement of Spirit Essence of the present invention and method scope, and it is all encompassed in the middle of claim scope of the present invention.

Claims (15)

1. the method for a first class relay station receiving system information, comprise: access Access link downlink radio frame is direct transferred relatively, and Direct link downlink radio frame is postponed or in advance, make first class relay station from Direct link, receive synchronizing signal and/or the broadcast that base station issues in the part or all of relay sub-frame that is configured to multimedia multicast Single Frequency Network MBSFN subframe of described Access link.

2. the method for claim 1, is characterized in that:

The relative Direct link of described Access link downlink radio frame downlink radio frame is postponed or 5n+m subframe in advance;

The value of described n is integer; The value of described m is 2 or 3 or 4;

When the value of 5n+m represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance when negative;

When the value of 5n+m is that timing represents that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

3. method as claimed in claim 2, is characterized in that:

The relative Direct link of described Access link downlink radio frame downlink radio frame is postponed or k OFDM symbol in advance;

For the Access link of common CP, the value of described k is-7≤k≤6;

For the Access link of expansion CP, the value of described k is-6≤k≤5;

When getting negative value, k represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

When k get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

4. method as claimed in claim 2 or claim 3, is characterized in that:

The relative Direct link of described Access link downlink radio frame downlink radio frame is postponed or Δ T in advance ₃, described Δ T ₃value for from the descending size that receives the protection interval that downlink or the conversion from downlink to descending reception arrange;

As described Δ T ₃while getting negative value, represent that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

As described Δ T ₃get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

5. method as claimed in claim 2 or claim 3, is characterized in that:

If the descending propagation delay of back haul link is T _t, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed to T _t.

6. method as claimed in claim 4, is characterized in that:

If the descending propagation delay of back haul link is T _t, the relative Direct link of described Access link downlink radio frame downlink radio frame is postponed to T _t.

7. the method for claim 1, is characterized in that:

The value of described n is-2 or-1 or 0 or 1.

8. a system for first class relay station receiving system information, comprises module and first class relay station is set; It is characterized in that:

The described module that arranges, for access Access link downlink radio frame is direct transferred relatively, Direct link downlink radio frame is postponed or in advance, the arbitrary descending sub frame that is configured to multimedia multicast Single Frequency Network MBSFN subframe that makes the subframe of described Direct link transmission synchronizing signal and/or broadcast and described Access link all or part of overlapping in time domain;

Described first class relay station, for be configured to all or part of relay sub-frame of MBSFN subframe at described Access link descending sub frame, receives from Direct link synchronizing signal and/or the broadcast that base station issues.

9. system as claimed in claim 8, is characterized in that:

Describedly arrange that module is postponed the relative Direct link of described Access link downlink radio frame downlink radio frame or 5n+m subframe in advance;

The value of described n is integer; The value of described m is 2 or 3 or 4;

When the value of 5n+m represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance when negative;

When the value of 5n+m is that timing represents that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

10. system as claimed in claim 9, is characterized in that:

Describedly arrange that module is also postponed the relative Direct link of described Access link downlink radio frame downlink radio frame or k OFDM symbol in advance;

For the Access link of common CP, the value of described k is-7≤k≤6;

For the Access link of expansion CP, the value of described k is-6≤k≤5;

When getting negative value, k represents that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

When k get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

11. systems as described in claim 9 or 10, is characterized in that:

Describedly arrange that module is also postponed the relative Direct link of described Access link downlink radio frame downlink radio frame or Δ T in advance ₃, described Δ T ₃value for from the descending size that receives the protection interval that downlink or the conversion from downlink to descending reception arrange;

As described Δ T ₃while getting negative value, represent that the relative Direct link of Access link downlink radio frame downlink radio frame in advance;

As described Δ T ₃get on the occasion of time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

12. systems as described in claim 9 or 10, is characterized in that:

If the descending propagation delay of back haul link is T _t, the described module that arranges is also postponed T by the relative Direct link of described Access link downlink radio frame downlink radio frame _t.

13. systems as claimed in claim 11, is characterized in that:

If the descending propagation delay of back haul link is T _t, the described module that arranges is also postponed T by the relative Direct link of described Access link downlink radio frame downlink radio frame _t.

14. systems as claimed in claim 8, is characterized in that:

The described module that arranges is positioned at base station or first class relay station or gateway.

15. systems as claimed in claim 8, it is characterized in that, describedly arrange that module is postponed the relative Direct link of Access link downlink radio frame downlink radio frame or in advance, make described Direct link send descending sub frame all or part of overlapping the referring in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link:

Module is set first postpones the relative Direct link of Access link downlink radio frame downlink radio frame or shifts to an earlier date, make described Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link, afterwards on Access link with the overlapping descending sub frame of the subframe of described transmission synchronizing signal and/or broadcast in part or all of subframe be set to MBSFN subframe; Or,

Module is set MBSFN subframe is first set on Access link, afterwards the relative Direct link of Access link downlink radio frame downlink radio frame is postponed or in advance, make described Direct link send descending sub frame all or part of overlapping in time domain of synchronizing signal and/or the subframe of broadcast and the arbitrary MBSFN of being configured to subframe of described Access link.