CN102790669B - A kind of control information transferring method and device thereof - Google Patents

Abstract

The present invention discloses a control information transmission method and its device. The method includes: the interfered base station copies the control information that needs to be transmitted on the interfered resource, and bears the copied control information on at least the near space subframe ABS. on other resources within the 100; the interfered base station sends the control information to the user equipment through the interfered resource and the other resources including at least the ABS respectively. Adopting the present invention can improve the success rate of receiving control information.

Description

A control information transmission method and device thereof

technical field

The present invention relates to the technical field of wireless communication, in particular to a control information transmission method and a device thereof.

Background technique

In the future wireless network, due to user needs and wireless environment, operators use multiple station types to cover different areas. For example, macro base stations (macro base stations) are used to cover large areas, pico base stations (micro base stations) are used to cover hotspot areas, and femto base stations (home base stations) are used to cover home environments, so as to realize high-speed data services in different environments. However, the above-mentioned nodes with different transmission powers coexist in the network, which makes the system have a heterogeneous topology, forming a wireless network environment in which multiple types of nodes and networks of the same frequency and different frequencies coexist, which will cause heterogeneous networks. mutual interference, as shown in Figure 1.

In order to avoid and reduce mutual interference between heterogeneous networks, 3GPP set up an eICIC (enhanced ICIC, enhanced interference coordination) work item under the research framework of LTE-AR10. For example, in the macro-pico scenario, considering that the picoUE (User Equipment, user equipment) at the edge of the pico cell will be strongly interfered by the macro base station in the case of the same frequency, the CRE (CellRangeExpansion, cell range expansion) technology is introduced. Avoid the interference of the macro base station to the picoUE.

In the macro-pico scenario, 3GPP proposes a solution to avoid inter-cell interference by coordinating time domain resources. Specifically, as shown in FIG. 2 , some subframes of the interferer base station (such as a macro base station) are set to ABS (Almost BlankSubframe, almost blank subframe), and the interfered base station (such as a pico base station) only schedules severely interfered pico UEs in the ABS. , so as to perform uplink and downlink transmission. Since the interferer base station only transmits the common pilot signal and a small amount of control information and data information such as synchronization, broadcast and paging in the ABS subframe, such as MIB or SIB (MIB and SIB are system information blocks), the interfered base station passes the Scheduling the UE on the ABS subframe can significantly reduce the interference received by the UE.

In order to realize the above time domain coordination scheme, the interference source base station needs to determine the subframe to be set as the ABS and notify the interfered base station, and the interfered base station notifies the ABS to the UE through signaling. Since the amount of information that the base station notifies the UE is limited, the subframes set as the ABS in one ABS period are the same, and the base station can notify the UE of the position of the ABS in an ABSpattern manner. Since the LTE (LongTerm Evolution, Long Term Evolution) system adopts synchronous HARQ (Hybrid Automatic Repeat Request) technology in the uplink, that is, the position of ACK/NACK feedback and retransmission of data relative to the initial transmission of data is fixed in time , therefore, the base station needs to consider the timing requirements of the uplink HARQ when setting the ABSpattern.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

In the ABS subframe, the interfering base station does not transmit the scheduling data of the UE, or transmits the scheduling data of the UE with low power, but still transmits necessary control information, such as MIB, SIB, primary/secondary synchronization information, pilot information and homing information. call information. Therefore, when the interfered UE receives the control information sent by the interfered base station in the ABS, it will receive strong interference from the interferer base station, and the successful transmission of the control information cannot be guaranteed.

Contents of the invention

The purpose of the present invention is to provide a control information transmission method and device to improve the success rate of control information reception. To this end, the embodiment of the present invention adopts the following technical solutions:

The control information transmission method provided by the embodiment of the present invention includes:

The interfered base station replicates the control information that needs to be transmitted on the interfered resource, and bears the replicated control information on other resources including at least the near space subframe ABS;

The interfered base station sends the control information to the user equipment through the interfered resource and the other resource including at least the ABS respectively.

The base station provided by the embodiment of the present invention includes:

A resource scheduling module, configured to replicate the control information that needs to be transmitted on the interfered resource, and carry the replicated control information on other resources including at least the near space subframe ABS;

A sending module, configured to send the control information to the user equipment through the interfered resource and the other resources including at least the ABS.

The control information transmission method provided by the embodiment of the present invention includes:

The user equipment determines the position of the ABS of the near empty subframe;

The user equipment receives control information sent by the base station through the interfered resource and other resources at least including the ABS.

The user equipment provided by the embodiment of the present invention includes:

A determining module, configured to determine the position of the near empty subframe ABS;

The receiving module is configured to receive the control information sent by the base station through the interfered resource and other resources at least including the ABS.

In the above embodiments of the present invention, by copying the control information that needs to be transmitted on the interfered resource to at least other resources including the ABS for retransmission, the probability of successful decoding of the control information by the user equipment is improved.

Description of drawings

FIG. 1 is a schematic diagram of a wireless heterogeneous layered network structure in the prior art;

FIG. 2 is a schematic diagram of a time domain coordination scheme in the prior art;

FIG. 3 is a schematic diagram of a control information sending process in an embodiment of the present invention;

4A, 4B, 4C and 4D are schematic diagrams of resources used to transmit control information in an ABS according to an embodiment of the present invention;

FIG. 5 is a schematic flow diagram of receiving control information in an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base station in an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a user equipment in an embodiment of the present invention.

detailed description

Aiming at the problems existing in the existing technology, the embodiment of the present invention proposes a control information transmission technical solution based on the existing network architecture and transmission architecture, without changing the existing control signaling transmission process, in the interfered cell , copy the control information that needs to be transmitted on the interfered resource to other resources including ABS at least for transmission, so as to achieve the purpose of retransmission, that is, to transmit control information in a redundant manner, especially when the transmission is seriously interfered And it may cause the user to fail to receive the control information successfully, so as to avoid the interference of the base station of the interference source to a certain extent, and improve the success rate of the UE receiving the control information.

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in FIG. 3, it is a schematic diagram of the control information transmission process in the embodiment of the present invention. As shown in the figure, on the base station side, the process of the base station using the ABS to transmit the control information to the UE includes the following steps:

In step 301, the interference source base station notifies the interfered base station of information about the ABS.

Specifically, the interference source base station can determine the interference situation of itself to the neighboring base station by performing signal measurement on the neighboring base station, and can determine the position of the ABS according to the measurement result. The interference source base station may perform the above-mentioned signal measurement and ABS determination operations according to a set period, and notify the interfered base station of the measured ABS position according to the set period. The process of this step can be realized through existing methods.

In step 302, the interfered base station notifies the UE covered by the ABS of relevant information.

Specifically, the interfered base station notifies the UE covered by the position of the ABS. In order to save the amount of data to be transmitted, thereby saving air interface resources, the interfered base station can use the ABSpattern method to notify the UE of the position of the ABS. This step can be realized through existing methods.

In step 303, the interfered base station uses the ABS to send the control information to be transmitted on the interfered resource to the UE in a redundant manner. Specifically, the interfered base station replicates the control information that needs to be transmitted on the interfered resource, carries the replicated control information on other resources including at least the ABS, and passes the interfered resource and the at least Other resources including the ABS send the control information to the UE.

According to whether the interfered resource used to transmit the control information is in the ABS, the embodiment of the present invention may use different redundant resources to transmit the control information. Specifically, if the interfered resource originally used to transmit the control information is not in the ABS, the ABS can be used to retransmit the control information, and of course the ABS and other non-ABS (ordinary subframes) can also be used to retransmit the control information; if the original If the interfered resource used to transmit the control information is within the ABS, other ABSs may be used to retransmit the control information, or other resources within the ABS may be used to transmit the control information. Specifically, the following redundant methods are used to transmit control information:

Way 1: In the case that the interfered resource originally used to transmit the control information is in the ABS, different time slots are used in the ABS to transmit the control information. In the prior art, the interfered base station transmits control information in a fixed time slot, and the subframe to which the time slot belongs happens to be an ABS, and at the same time, the time slot may be interfered by a strong signal from the interference source base station. The embodiment of the present invention In this case, in addition to transmitting the control information in the original fixed time slot, the interfered base station also uses other time slots in the ABS to transmit the control information. As shown in Figure 4A, the downlink time slot n in the ABS is the time slot specified by the existing protocol for transmitting primary/secondary synchronization information and pilot information to the UE. In the embodiment of the present invention, the downlink time slot n and Downlink time slots k and m transmit primary/secondary synchronization information and pilot information. According to different frame structures, in the embodiment of the present invention, the number of downlink time slots selected for transmission of control information in the ABS can be 2 or more than 2. In each of the above time slots, the same frequency can be used to transmit control information, the frequency can be selected with reference to the existing protocol (such as using the frequency specified in the existing protocol), of course, the frequency resources used to transmit control information can also be re-determined . These time slots and frequency resources for transmitting control information can be pre-agreed between the base station and the UE, or configured in other ways, for example, the base station configures these transmission resource information to the UE through control signaling.

Method 2: In the case that the interfered resource originally used to transmit the control information is in the ABS, use different frequencies in the same time slot to transmit the control information in the ABS. In the prior art, the interfered base station transmits control information in a certain fixed frequency band in a certain fixed time slot, and the subframe to which the video resource belongs happens to be ABS, and at the same time, the video resource may be interfered by a strong signal from the interference source base station . In the embodiment of the present invention, in addition to transmitting the control information in the original fixed frequency band of the fixed time slot, the interfered base station also uses other frequency bands of the time slot to transmit the control information. As shown in Figure 4B, the frequency band P1 of the downlink time slot n in the ABS is the frequency band specified by the existing protocol for transmitting primary/secondary synchronization information and pilot information to the UE. In the embodiment of the present invention, this downlink time slot is used Frequency band P1 and frequency band P2 of n transmit primary/secondary synchronization information and pilot information. Of course, the number of selected frequency bands may also be more than two. The frequency resources used to transmit control information can be pre-agreed between the base station and the UE, or configured in other ways, for example, the base station configures these transmission resource information to the UE through control signaling.

Method 3: Combining the above method 1 and method 2, the method 3 can be obtained, that is, at least 2 time slots in the ABS, and the transmission of control information at different frequencies on these time slots, as shown in Figure 4C .

Way 4: In the case that the interfered resource originally used to transmit the control information is not in the ABS, use other subframes including the ABS at least (for example, use the ABS, or use the ABS and common subframes) to transmit the control information. The number of other subframes may be one or multiple, and may be determined according to existing protocol regulations or depending on the degree of interference. In this way, according to the type of control information to be transmitted, the resource blocks used in the ABS or other subframes can be specifically determined, for example, for control information that needs to be transmitted through fixed resources (such as common pilot signals, main/ Secondary synchronization information, etc.) can be transmitted according to the resources specified in the existing protocol, and for other control information, the resource block to be used is determined according to needs, and no specific requirements are made here. Fig. 4D shows a control information transmission manner. This method can also be used in combination with method 1, 2 or 3, that is, the above-mentioned method 1, 2 or 3 is used in the ABS to transmit control information.

The above-mentioned control information may be carried in control signaling, and the transmission mode of the control signaling may be a broadcast mode or a unicast mode. The broadcast control signaling used in this step can reuse the existing control signaling design method, for example, the control signaling design method of MIB and SIB1. The unicast control signaling used in this step can reuse the existing dedicated control signaling in unicast mode, such as reconfiguration signaling, or redesign a new signaling mode.

In the above procedure, the above control information sent by the interfered base station may include but not limited to common pilot signal, primary/secondary synchronization information, broadcast (MIB), SIB, paging and other information. In a nutshell, the control information may be the control information sent by the interfered base station that is interfered by the interferer base station in other resources (such as subframes), or the control information that needs to be sent through the ABS in the prior art, or other control information information. For example, for control information that needs to be transmitted on a fixed time slot, such as common pilot signals and primary/secondary synchronization information, in addition to using the original transmission resources for transmission, ABS can also be used for transmission to improve the success rate of UE reception; Control information for other content can be transmitted on any resource block in the ABS.

In the above procedure, the interfered base station may send control information to all UEs within its coverage area through the ABS, and may also send control information to the interfered UE within its coverage area. Wherein, the interfered base station may determine which UEs belong to the interfered UEs through the measurement information reported by the UEs in an existing manner.

As shown in Figure 5, on the UE side, the process for the UE to receive the control information sent by the base station through the ABS may include the following steps:

In step 501, the UE receives the position indication information of the ABS sent by the base station to determine the position of the ABS.

Specifically, after receiving the ABS location indication information sent by the base station through the ABSpattern mode, the UE can know whether the corresponding subframe is an ABS according to the bits therein.

Step 502, according to the position of the ABS, the UE receives the control information sent by the base station through the interfered resource and other resources at least including the ABS.

In this step, when the interfered resource belongs to a resource in the ABS, the UE receives the control information on other resources different from the interfered resource in the ABS to which the interfered resource belongs, or/and on other ABSs; In the case that the interfered resource does not belong to resources in an ABS, the UE receives the control information on at least one ABS.

Specifically, corresponding to the manner in which the base station sends the control information above, the manner in which the UE receives the control information may include:

If the base station uses the above-mentioned method 1 to send control information, the UE receives the control information sent by the base station in different time slots in the ABS; Receive the control information sent by the base station; if the base station uses the above method 3 to send the control information, the UE receives the control information sent by the base station in different time slots in the ABS and at different frequencies in the time slot; similarly, if the base station If the control information is sent in the fourth manner above, the UE receives the control information in the ABS and other subframes (if a common subframe is used for retransmission in addition to the ABS). These time slots and frequency resources for transmitting control information can be pre-agreed between the base station and the UE, or configured in other ways, for example, the base station configures these transmission resource information to the UE through control signaling.

Further, the process may also include:

Step 503, after parsing out the control information, the UE returns confirmation information to the base station.

It can be seen from the above process that in the embodiment of the present invention, the interfered base station sends the control information through the above redundant method, which can solve the problem that the control information of the interfered base station is interfered by the interferer base station to a certain extent, and guarantees to a certain extent This ensures the successful transmission of control information, and improves the efficiency of receiving control information and user experience of UEs in the CRE area. Of course, any product that implements the embodiments of the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.

Based on the same technical concept, the embodiment of the present invention also provides a base station applicable to the above process.

Referring to FIG. 6, it is a schematic structural diagram of a base station provided by an embodiment of the present invention. As shown in the figure, the base station may include:

The resource scheduling module 601 is configured to copy the control information that needs to be transmitted on the interfered resource, and carry the copied control information on other resources including at least the near space subframe ABS;

The sending module 602 is configured to send the control information to the user equipment through the interfered resource and the other resource including at least the ABS respectively.

In the above-mentioned base station, the resource scheduling module 601 may carry the replicated control information in a resource other than the interfered resource in the ABS to which the interfered resource belongs when the interfered resource belongs to a resource in the ABS or/and borne on other ABSs; in the case that the interfered resource does not belong to resources in the ABS, the replicated control information is borne on at least one ABS.

Further, when the resource scheduling module 601 carries the replicated control information on resources different from the interfered resource in the ABS to which the interfered resource belongs, in the ABS to which the interfered resource belongs, the interfered The copied control information is carried in other time slots than the time slot where the resource is located; or, in the ABS to which the interfered resource belongs, the time slot where the interfered resource is located is carried on a frequency other than the frequency where the interfered resource is located Copy control information.

In the above base station, the sending module 602 may send the control signaling to the user equipment in a broadcast or unicast manner, which carries the control information.

In the above base station, the sending module 602 may send the control information to the interfered user equipment.

Referring to FIG. 7, it is a schematic structural diagram of a user equipment provided by an embodiment of the present invention. The user equipment may include:

A determining module 701, configured to determine the position of the ABS of the near empty subframe;

The receiving module 702 is configured to receive control information sent by the base station through the interfered resource and other resources at least including the ABS.

In the above user equipment, the receiving module 701 may, if the interfered resource belongs to a resource in an ABS, the user equipment is on a resource different from the interfered resource in the ABS to which the interfered resource belongs, Or/and receiving the control information on other ABSs; if the interfered resource does not belong to resources in an ABS, the user equipment receives the control information on at least one ABS.

Further, the receiving module 702 may receive the control information in a time slot other than the time slot where the interfered resource belongs in the ABS to which the interfered resource belongs; or, in the ABS to which the interfered resource belongs , within the time slot where the interfered resource is located, the control information is received on a frequency other than the frequency where the interfered resource is located.

In the above user equipment, the receiving module may receive the control signaling sent by the base station to the user equipment in a broadcast or unicast manner, which carries the control information.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, or can be located in at least two devices in one or more devices in the embodiment according to corresponding changes. The modules in the above embodiments can be combined into one module, and can also be further split into multiple sub-modules.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (12)

1. A control information transmission method, characterized in that, comprising: The interfered base station replicates the control information that needs to be transmitted on the interfered resource, and bears the replicated control information on other resources including at least the near space subframe ABS; The interfered base station sends the control information to the user equipment through the interfered resource and the other resource including at least ABS; Wherein, in the case that the interfered resource does not belong to the resources in the ABS, the copied control information is carried on the other resources including at least the ABS, specifically: the copied control information is carried on at least one ABS superior; In the case that the interfered resource belongs to a resource in the ABS, carry the replicated control information on the other resource including at least the ABS, specifically: carry the replicated control information on the resource to which the interfered resource belongs other resources in the ABS that are different from the interfered resources, or/and carried on other ABSs; Other resources different from the interfered resource in the ABS to which the interfered resource belongs include: In the ABS to which the interfered resource belongs, other time slots other than the time slot where the interfered resource is located; or In the ABS to which the interfered resource belongs, in the time slot where the interfered resource is located, other frequencies than the frequency where the interfered resource is located. 2. The method according to claim 1, wherein the interfered base station sends control signaling to the user equipment in a broadcast or unicast manner, which carries the control information. 3. The method according to claim 1, wherein the interfered base station sends the control information to the interfered user equipment. 4. The method according to any one of claims 1-3, wherein the control information includes one or any combination of broadcast information, primary/secondary synchronization information, pilot information and paging information. 5. A base station, characterized in that, comprising: A resource scheduling module, configured to replicate the control information that needs to be transmitted on the interfered resource, and carry the replicated control information on other resources including at least the near space subframe ABS; a sending module, configured to send the control information to the user equipment through the interfered resource and the other resources including at least the ABS; Wherein, the resource scheduling module is specifically configured to bear the copied control information on at least one ABS when the interfered resource does not belong to resources in the ABS; The resource scheduling module is specifically further configured to, in the case that the interfered resource belongs to a resource in an ABS, carry the copied control information in another resource different from the interfered resource in the ABS to which the interfered resource belongs. resource, or/and carried on other ABS; The resource scheduling module is specifically configured to, when carrying the replicated control information on resources different from the interfered resource in the ABS to which the interfered resource belongs, in the ABS to which the interfered resource belongs, the The copied control information is carried in time slots other than the time slot where the interfered resource is located; or, in the ABS to which the interfered resource belongs, in the time slot where the interfered resource is located, other frequencies than the frequency where the interfered resource is located hosts replicated control information. 6. The base station according to claim 5, wherein the sending module is specifically configured to send control signaling to the user equipment in a broadcast or unicast manner, which carries the control information. 7. The base station according to claim 5, wherein the sending module is specifically configured to send the control information to the interfered user equipment. 8. A control information transmission method, comprising: The user equipment determines the position of the ABS of the near empty subframe; The user equipment receives the control information sent by the base station through the interfered resource and other resources including at least ABS; Wherein, the user equipment receives the control information sent by the base station through the other resources including at least the ABS, specifically: in the case that the interfered resource does not belong to the resources in the ABS, the user equipment in at least one receiving the control information on the ABS; In the case that the interfered resource belongs to a resource in an ABS, the user equipment receives the resource on another resource different from the interfered resource in the ABS to which the interfered resource belongs, or/and on another ABS control information; Other resources different from the interfered resource in the ABS to which the interfered resource belongs include: In the ABS to which the interfered resource belongs, other time slots other than the time slot where the interfered resource is located; or In the ABS to which the interfered resource belongs, in the time slot where the interfered resource is located, other frequencies than the frequency where the interfered resource is located. 9. The method according to claim 8, wherein the user equipment receiving base station sends the control signaling to the user equipment in a broadcast or unicast manner, which carries the control information. 10. The method according to any one of claims 8-9, wherein the control information includes one or any combination of broadcast information, primary/secondary synchronization information, pilot information, and paging information. 11. A user equipment, characterized in that, comprising: A determining module, configured to determine the position of the near empty subframe ABS; A receiving module, configured to receive control information sent by the base station through the interfered resource and other resources at least including ABS; Wherein, the receiving module is specifically configured to, when the interfered resource does not belong to a resource in an ABS, the user equipment receives the control information on at least one ABS; The receiving module is specifically further configured to, when the interfered resource belongs to a resource in an ABS, the user equipment is on a resource different from the interfered resource in the ABS to which the interfered resource belongs, or/and receiving said control information on other ABSs; The receiving module is specifically configured to, in the ABS to which the interfered resource belongs, receive the control information in a time slot other than the time slot where the interfered resource is located; or, in the ABS to which the interfered resource belongs Within the time slot where the interfered resource is located, the control information is received on a frequency other than the frequency where the interfered resource is located. 12. The user equipment according to claim 11, wherein the receiving module is specifically configured to: the receiving base station sends control signaling to the user equipment in a broadcast or unicast manner, which carries the control information.