CN102111208A - 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 kind 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 kind relay station receiving system information.

Background technology

Relaying technique has caused attention more and more widely as a kind of emerging technology, is regarded as the key technology of B3G/4G.Because following radio communication or cellular system require to increase coverage, support the higher rate transmission, this has proposed new challenge to wireless communication technology.Simultaneously, 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 that causes thus is more serious.By relaying technique, traditional one hop link can be divided into a plurality of multi-hop links, because distance shortens, this will greatly reduce path loss, help to improve transmission quality, enlarge communication range, thereby provide quicker better service for the 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 the base station that the base station participates in service are called as the link that direct transfers (Direct Link).As shown in Figure 1.

In 3GPP (3rd Generation Partnership Project, third generation partner program) Release 9 release criteria TR 36.814_132, relay station is divided into two classes: the first kind relay station and the second class relay station at present.

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

First kind relay station can be managed the sub-district, and In the view of the user, separate between sub-district that it is managed and the former sub-district;

The sub-district that first kind relay station is managed has independently Physical Cell Identifier (Physical CellID), and first kind relay station will send himself synchronizing channel and reference symbol;

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

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

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

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

Usually adopt the method that disposes relaying time slot (gaps) to solve the problem of above-mentioned interference at present, promptly on descending sub frame, configure some time slots, be called the relaying time slot, continue in these on the time slot, first kind relay station is from base station received signal, and do not send signal to the user, to avoid interference between self transmitting terminal and the receiving terminal occurring at first kind relay station.The subframe at these relaying time slot places is called as relay sub-frame.

Therefore, system need carry 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 the user, allows the user not receive signal from relay station on the relaying time slot of this relay sub-frame.

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

According to said method, in the relay sub-frame that is configured to the MBSFN subframe, first kind relay station can (preceding 1 or 2 symbol in the subframe) send signal to the user on the non-MBSFN symbol of this subframe, and with the MBSFN symbol as the relaying time slot, on the relaying time slot, receive and do not send signal, disturb to avoid producing between first kind relay station self transmitting terminal and the receiving terminal to the user from signal of base station.As shown in Figure 2.

In LTE and LTE-A FDD system, the least unit of time span is defined as T _s=1/30720 millisecond.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 slot are formed a subframe (Subframe), and promptly the time span of each subframe is 1 millisecond.As shown in Figure 3.

At subcarrier spacing is under the 15KHz situation, and each slot in the downlink radio frame comprises 7 or 6 OFDM symbols, and the length of each OFDM symbol own is 2048T _sIn order to reduce intersymbol interference, need on 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), is specially:

(1) in the slot that adopts common CP, 7 OFDM symbols are arranged generally, 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 the slot that adopts expansion CP, 6 OFDM symbols are arranged generally, for No. 0 to No. 5 OFDM symbol, its expansion CP length T _ECP=512T _s

In this article, OFDM symbol itself is done as a whole treating with its CP that is added, be referred to as the OFDM symbol, according to the length difference 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. 4.

Protocol specification according to LTE/LTE-A, PSS (Primary synchronization signal can be launched in the base station on last OFDM symbol of slot0 and 10, master sync signal), on the penult OFDM of slot0 and 10 symbol, launch SSS (Secondary synchronization signal, auxiliary synchronous signals), and on preceding 4 OFDM symbols of slot1, launch PBCH (Physicalbroadcast channel, Physical Broadcast Channel), as shown in Figure 5.

On the Direct link, carry out according to predetermined emission rule sending PSS, SSS on subframe 0 and 5 and send PBCH on subframe 0 base station, and receiving terminal need not to obtain PDCCH and just can directly receive.For the first kind relay station that can't receive Direct link PDCCH, if can directly monitor PSS, SSS on the Direct link and PBCH then can reduce expense and complexity, make the base station need not sending broadcast and the synchronizing signal that sent on the Direct link again to first kind relay station specially on the Backhaul link.

But the protocol specification present according to 3GPP, on the Access link, in the radio frames 0,4,5,9 subframes cannot be configured to the MBSFN subframe, be that these subframes can not become relay sub-frame, on these subframes, first kind relay station can not carry out descending reception from the base station, in case the subframe 0 of Direct link or 5 and the Access link 0,4,5, certain subframe in 9 occurs simultaneously, then generally this moment, first kind relay station just can't directly receive PSS on the 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 6.

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

Summary of the invention

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

In order to address the above problem, the invention provides a kind of method of first kind relay station receiving system information, comprise: will insert (Access) link downlink radio frame and direct transfer relatively that (Direct) link downlink radio frame is postponed or in advance, make first kind relay station receive synchronizing signal and/or the broadcast that the base station issues from the Direct link on 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 an 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 the 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 receiving the protection size at interval that downlink or the conversion from downlink to descending reception are provided with from descending;

As described Δ T ₃Represent when getting negative value 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 the 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 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 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 kind relay station receiving system information, comprises module and first kind relay station are set;

The described module that is provided with, be used for that access (Access) link downlink radio frame direct transferred relatively that (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 that described Direct link sends the subframe of synchronizing signal and/or broadcast and described Access link all or part of overlapping on time domain;

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

Further, describedly be provided with 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 an 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 be provided with 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 the time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

Further, describedly be provided with 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 receiving the protection size at interval that downlink or the conversion from downlink to descending reception are provided with from descending;

As described Δ T ₃Represent when getting negative value 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 the 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 described module that is provided with is also postponed T with the relative Direct link of described Access link downlink radio frame downlink radio frame _t

Further, the descending propagation delay of establishing back haul link is T _t, the described module that is provided with is also postponed T with the relative Direct link of described Access link downlink radio frame downlink radio frame _t

Further, the described module that is provided with is positioned at base station or first kind relay station or gateway.

Further, describedly be provided with 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 being meant on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link:

Be provided with that module is earlier 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 on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link, afterwards on the 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 the MBSFN subframe; Perhaps,

Module is set the MBSFN subframe is set on the Access link earlier, 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 on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link.

In sum, the invention provides a kind of system and method for first kind relay station receiving system information, with the subframe 0 of Direct link and 5 and the Access link on subframe 0,4,5,9 stagger, and by finer adjustment, make first kind relay station can be directly receive PBCH and/or synchronizing signal (comprising PSS and SSS) from the base station from the Direct link, reduce expense and complexity, make the base station need not on the Backhaul link specially to first kind relay station send again with the Direct link on the broadcast and/or the synchronizing signal that repeat.

Description of drawings

Fig. 1 is the junction network structural representation;

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

Fig. 3 is the wireless frame structure schematic diagram;

Fig. 4 is the Slot structural representation;

Fig. 5 is wireless frame structure and PSS, SSS and PBCH structural representation;

Fig. 6 is the Direct link schematic diagram that conflicts with the Access link;

Fig. 7 is that the inventive method is carried out downlink frame schematic diagram regularly;

Fig. 8 is that application example 1 of the present invention carries out downlink frame timing method schematic diagram;

Fig. 9 is that application example 2 of the present invention carries out downlink frame timing method schematic diagram;

Figure 10 application example 3 of the present invention carries out downlink frame timing method schematic diagram;

Figure 11 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 kind relay station receiving system information, make first kind relay station can directly receive PBCH and/or PSS, SSS from the base station, reduce expense and complexity, make the base station need not on the Backhaul link, to send broadcast and/or the synchronizing signal identical again to first kind relay station specially with the Direct link.

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

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

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

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

Be provided with 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) adopts subframe regularly, be provided with promptly 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 n is an 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 is provided with promptly that module is postponed the relative Direct link of Access link downlink radio frame downlink radio frame or k OFDM symbol in advance;

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 the time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

(3) fixed delay regularly is provided with promptly that module is postponed the relative Direct link of Access link downlink radio frame downlink radio frame or Δ T in advance ₃, Δ T ₃Value for receiving the protection size at interval that downlink or the conversion from downlink to descending reception are provided with from descending;

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

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

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

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

Be provided with 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 of the arbitrary MBSFN of being configured to subframe that the Direct link sends the subframe of synchronizing signal and/or broadcast and Access link overlapping on time domain can be in the following mode any:

(a) be provided with that module is earlier 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 on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link, afterwards on the 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 the MBSFN subframe;

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

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

Above-mentioned synchronizing signal comprises PSS and SSS.

To the relative Direct link of Access link downlink radio frame downlink radio frame postpone or the mode that shifts to an earlier date can for, to Access link downlink radio frame carry out subframe regularly, symbol regularly, fixed delay regularly and propagation delay regularly;

Below several timing modes are specifically described:

(1) subframe regularly 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 an integer, m ∈ 2,3,4}.Promptly 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 an integer, represents that when 5n+m gets negative value the relative Direct link of time-domain position downlink radio frame in advance.

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

(2) symbol regularly 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 k OFDM symbol, and k is an integer;

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

${\mathrm{\&Delta;<figure-callout\; id="2"\; label="T"\; filenames="H2009102525395E00012.png,H2009102525395E00041.png"\; state="\{\{state\}\}">T</figure-callout>}}_2=\left\{\begin{array}{cc}-[2208+\left(\right|k|-1)\&CenterDot;2192]\&CenterDot;T_s,& -7\&le;k\&le;-1\\ 0,& k=0\\ k\&CenterDot;\left(2192\right)\&CenterDot;T_s,& 1\&le;k\&le;6\end{array}\right.$

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

When adopting expansion CP, the starting point of Access link downlink radio frame is postponed 0 to 5 OFDM symbol, perhaps shift to an earlier date 0 to 6 OFDM symbol, promptly 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 is regularly carried out protection that the conversion from downlink to descending reception is provided with 1 time domain length T at interval according to system for first kind relay station _GP1And/or system carries out from the time domain length T at the protection interval 2 that the descending conversion that receives downlink is provided with for first kind relay station _GP2, the starting point of Access link downlink radio frame is postponed, shifted to an earlier date or remains unchanged, promptly the starting point time domain side-play amount of Access link downlink radio frame is

Δ T ₃=-T _GP1Perhaps T _GP2Perhaps 0

Δ T ₃Represent when getting negative value that time-domain position in advance.

Preferably, Δ T ₃=T _GP2Perhaps 0.

(4) propagation delay timing is 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, promptly 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, with the starting point time-domain position t of Access link downlink radio frame _ASBe set at

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 kind relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _DS, the Access link adopts common CP, and system carries out from the duration T at the protection interval 2 that the descending conversion that receives downlink is provided with for first kind relay station _GP2=1096T _s, the propagation delay T on the Backhaul link _t=307T _s, the detailed process of carrying out the frame timing for Access link downlink radio frame is:

(1) subframe regularly, promptly set the starting point of Access link downlink radio frame and postpone 3 subframes for starting point with respect to Direct link downlink radio frame, be n=0, m=3, promptly 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 is regularly postponed 1 OFDM symbol with the starting point of Access link downlink radio frame, i.e. k=1, because the Access link adopts common CP, then 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 is regularly carried out from the time domain length T at the protection interval 2 that the descending conversion that receives downlink is provided with for first kind relay station according to system _GP2, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed T _GP2, promptly 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 is 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 T _t, promptly 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, with the starting point time-domain position t of Access link downlink radio frame _ASBe set at

t _AS＝t _DS+ΔT ₁+ΔT ₂+ΔT ₃+ΔT ₄

＝t _DS+92160·T _s+2192·T _s+1096·T _s+307·T _s

＝t _DS+95755·T _s

The starting point time-domain position of expression Access link downlink radio frame is postponed 95755T than the starting point of Direct link downlink radio frame _s, as shown in Figure 8, if Access subframe 7 and 2 is configured to the MBMS subframe as relay sub-frame, then first kind relay station can be at PSS, the SSS and the PBCH that directly receive on Access subframe 7 and 2 on the Direct link.

Application example 2

In a first kind relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _DS, the Access link adopts common CP, and system carries out from the duration T at the protection interval 2 that the descending conversion that receives downlink is provided with for first kind relay station _GP2=1096T _s, the propagation delay T on the Backhaul link _t=307T _s, the detailed process of carrying out the frame timing for Access link downlink radio frame is:

(1) subframe regularly, the starting point of promptly setting Access link downlink radio frame shifts to an earlier date 1 subframe for the starting point with respect to Direct link downlink radio frame, be n=-1, m=4, promptly 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 is regularly postponed 5 OFDM symbols with the starting point of Access link downlink radio frame, i.e. k=5, because the Access link adopts common CP, then 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 is regularly carried out from the time domain length T at the protection interval 2 that the descending conversion that receives downlink is provided with for first kind relay station according to system _GP2, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed T _GP2, promptly 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 is 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, promptly 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, with the starting point time-domain position t of Access link downlink radio frame _ASBe set at

t _AS＝t _DS+ΔT ₁+ΔT ₂+ΔT ₃+ΔT ₄

＝t _DS-30720·T _s+10960·T _s+1096·T _s+307·T _s

＝t _DS-18357·T _s

The starting point time-domain position of expression 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 9, if Access subframe 1 is configured to the MBMS subframe as relay sub-frame, this moment, first kind relay station can be directly at the PBCH that receives on the Access subframe 1 on the Direct link.

Among this embodiment the base station not need resend on the Backhaul link with the Direct link on identical broadcast.

Application example 3

In a first kind relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _DS, the Access link adopts common CP, and system carries out protection that the conversion from downlink to descending reception is provided with 1 duration T at interval for first kind relay station _GP1=1096T _s, the propagation delay T on the Backhaul link _t=522T _s, the detailed process of carrying out the frame timing for Access link downlink radio frame is:

(1) subframe regularly, promptly set the starting point of Access link downlink radio frame and postpone 2 subframes for starting point with respect to Direct link downlink radio frame, be n=0, m=2, promptly 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 regularly, with the starting point of Access link downlink radio frame 6 OFDM symbols in advance, i.e. k=-6 because the Access link adopts common CP, then 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 is regularly carried out protection that the conversion from downlink to descending reception is provided with 1 time domain length T at interval according to system for first kind relay station _GP1, the relative Direct link of Access link downlink radio frame downlink radio frame is shifted to an earlier date T _GP1, promptly 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 is 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, promptly 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, with the starting point time-domain position t of Access link downlink radio frame _ASBe set at

t _AS＝t _DS+ΔT ₁+ΔT ₂+ΔT ₃+ΔT ₄

＝t _DS+61440·T _s-13168·T _s-1096·T _s+522·T _s

＝t _DS+47698·T _s

The starting point time-domain position of expression Access link downlink radio frame is postponed 47698T than the starting point of Direct link downlink radio frame _s, as shown in figure 10, if the subframe 8 of Access link is configured to the MBMS subframe as relay sub-frame, this moment, first kind relay station can be directly at the PSS and the SSS that receive on the subframe 8 of Access link on the Direct link.

Application example 4

In a first kind relay station frequency division duplex system, the starting point time-domain position of Direct link downlink radio frame is t _DS, the Access link adopts common CP, and system carries out from the duration T at the protection interval 1 that the descending conversion that receives downlink is provided with for first kind relay station _GP1=1096T _s, the propagation delay T on the Backhaul link _t=307T _s, the detailed process of carrying out the frame timing for Access link downlink radio frame is:

(1) subframe regularly, 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, promptly 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 regularly remains unchanged the starting point time-domain position of Access link downlink radio frame, i.e. k=0, and then the starting point time domain side-play amount of Access link downlink radio frame is

ΔT ₂＝0

(3) fixed delay is regularly carried out from the time domain length T at the protection interval 2 that the descending conversion that receives downlink is provided with for first kind relay station according to system _GP2, the relative Direct link of Access link downlink radio frame downlink radio frame is postponed T _GP2, promptly 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 is 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, promptly 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, with the starting point time-domain position t of Access link downlink radio frame _ASBe set at

t _AS＝t _DS+ΔT ₁+ΔT ₂+ΔT ₃+ΔT ₄

＝t _DS-61440·T _s+0+1096·T _s+307·T _s

＝t _DS-60037·T _s

The starting point time-domain position of expression 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 11, if Access subframe 2 and 7 is configured to the MBMS subframe as relay sub-frame, then this moment, first kind relay station can be directly at PSS, the SSS and the PBCH that receive on Access subframe 2 and the subframe 7 on the Direct link.

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

Claims (15)

1. the method for a first kind relay station receiving system information, comprise: will insert (Access) link downlink radio frame and direct transfer relatively that (Direct) link downlink radio frame is postponed or in advance, make first kind relay station receive synchronizing signal and/or the broadcast that the base station issues from the Direct link on 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 postponed or 5n+m subframe in advance;

The value of described n is an 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 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 the time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

4. as claim 2 or 3 described methods, it is characterized in that:

The relative Direct link of described Access link downlink radio frame downlink radio frame postponed or Δ T in advance ₃, described Δ T ₃Value for receiving the protection size at interval that downlink or the conversion from downlink to descending reception are provided with from descending;

As described Δ T ₃Represent when getting negative value 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 the time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

5. as claim 2 or 3 described methods, it 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 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 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. the system of a first kind relay station receiving system information comprises module and first kind relay station are set; It is characterized in that:

The described module that is provided with, be used for that access (Access) link downlink radio frame direct transferred relatively that (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 that described Direct link sends the subframe of synchronizing signal and/or broadcast and described Access link all or part of overlapping on time domain;

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

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

Describedly be provided with 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 an 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 Acccss 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 be provided with 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 the time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

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

Describedly be provided with 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 receiving the protection size at interval that downlink or the conversion from downlink to descending reception are provided with from descending;

As described Δ T ₃Represent when getting negative value 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 the time represent that the relative Direct link of Access link downlink radio frame downlink radio frame postpones.

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

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

13. system 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 is provided with is also postponed T with the relative Direct link of described Access link downlink radio frame downlink radio frame _t

14. system as claimed in claim 8 is characterized in that:

The described module that is provided with is positioned at base station or first kind relay station or gateway.

15. system as claimed in claim 8, it is characterized in that, describedly be provided with 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 being meant on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link:

Be provided with that module is earlier 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 on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link, afterwards on the 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 the MBSFN subframe; Perhaps,

Module is set the MBSFN subframe is set on the Access link earlier, 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 on time domain of the arbitrary MBSFN of being configured to subframe of the subframe of synchronizing signal and/or broadcast and described Access link.

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