WO2013143375A1

WO2013143375A1 - Method and communication device for determining location of common search space

Info

Publication number: WO2013143375A1
Application number: PCT/CN2013/072111
Authority: WO
Inventors: 夏金环; 武雨春; 吴强
Original assignee: 华为技术有限公司
Priority date: 2012-03-26
Filing date: 2013-03-04
Publication date: 2013-10-03
Also published as: CN103368714B; CN103368714A

Abstract

A method and a communication device for determining the location of a common search space (CSS). The method comprises: determining the location of a CSS in an extended-physical downlink control channel (E-PDCCH) on a physical downlink shared channel (PDSCH) resource according to a fixed resource mapping mode; or, determining the location of a CSS in an E-PDCCH on a PDSCH resource according to a frequency hopping resource mapping mode, the fixed resource mapping mode indicating that the location of the CSS is fixed, and the frequency hopping resource mapping mode indicating that the location of the CSS is changeable. In embodiments of the present invention, the location of the CSS in the E-PDCCH is indicated through the fixed resource mapping mode or the frequency hopping resource mapping mode, so as to ensure that the communication device can determine the location of the CSS without performing signaling exchange.

Description

Method and communication device for determining location of public search space

This application claims priority to Chinese Patent Application No. 201210082805.6, entitled "Method for Determining Public Search Space Location and Communication Equipment", filed on March 26, 2012, the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to the field of wireless communications, and in particular, to a method and a communication device for determining a Common Search Space (CSS) location. Background technique

In the LTE (Long Term Evolution) system, a PDCCH (Physical Downlink Control Channel) is used to carry Downlink Control Information (DCI). The UE (User Equipment) obtains the resource location of the downlink data and the related demodulation information by detecting the DCI on the PDCCH. As the number of users and various application scenarios increase, PDCCH resources are insufficient. In order to solve this problem, an extended PDCCH (Extended-PDCCH, E-PDCCH) is added to the PDSCH (Physical Downlink Shared Channel) resource in the LTE R (Release, Release 11). The high layer signaling notifies the UE in the connected state of the location of the E-PDCCH. For a UE that is initially in the access network or in an idle state, the base station cannot notify the location of the E-PDCCH through high layer signaling. Summary of the invention

The embodiment of the invention provides a method for determining a CSS location and a communication device, which can ensure that the communication device can determine the location of the CSS in the E-PDCCH without signaling interaction.

In one aspect, a method for determining a CSS location is provided, including: determining, according to a fixed resource mapping manner, a location of a common search space CSS in an extended physical downlink control channel E-PDCCH on a physical downlink shared channel PDSCH resource; or, according to Determining the location of the CSS in the E-PDCCH on the PDSCH resource, where the fixed resource mapping mode indicates that the location of the CSS is fixed, and the hopping resource mapping mode indicates that the location of the CSS is changed. .

On the other hand, a communication device is provided, including: an obtaining unit, configured to acquire a fixed resource mapping manner or a frequency hopping resource mapping manner, where the fixed resource mapping manner indicates that the location of the CSS is fixed, and the frequency hopping resource mapping is performed. The mode indicates that the location of the CSS is changed. The determining unit is configured to determine, according to the fixed resource mapping manner, a location of a common search space CSS in the extended physical downlink control channel E-PDCCH on the physical downlink shared channel PDSCH resource; or The location of the CSS in the E-PDCCH on the PDSCH resource is determined according to the frequency hopping resource mapping manner.

In the embodiment of the present invention, the indication is indicated by a fixed resource mapping manner or a frequency hopping resource mapping manner. The location of the CSS in the E-PDCCH can ensure that the communication device can determine the location of the CSS without signaling interaction. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

FIG. 1 is a schematic diagram of resource mapping to which an embodiment of the present invention is applicable.

2 is a schematic flow chart of a method of determining a location of a CSS according to an embodiment of the present invention. FIG. 3 is a schematic diagram of an example of a resource mapping manner of a CSS in an E-PDCCH according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of another example of a resource mapping manner of a CSS in an E-PDCCH according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of another example of a resource mapping manner of a CSS in an E-PDCCH according to an embodiment of the present invention.

6 is a schematic block diagram of a communication device in accordance with an embodiment of the present invention.

FIG. 7 is a schematic block diagram of a communication device in accordance with another embodiment of the present invention.

FIG. 8 is a schematic block diagram of a communication device in accordance with another embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention. The technical solution of the present invention can be applied to various communication systems, for example: Global System of Mobile communication (GSM), Code Division Multiple Access (CDMA) system, wideband code division multiple access ( Wideband Code Division Multiple Access Wireless (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), etc. It should be understood that, in the embodiment of the present invention, the communication device may be a UE. UE can also be called a mobile terminal (Mobile Terminal, MT), mobile user equipment, etc., such as mobile phones (or "cellular" phones) and computers with mobile terminals, for example, portable, pocket, handheld, computer built-in or car-mounted mobile Device. The communication device may also be a base station, for example, an evolved base station (eNB or e-NodeB, evolved Node B) in LTE.

As shown in FIG. 1, in one subframe, frequency domain resources may be divided into PDCCH resources and PDSCH resources. The PDCCH can generally carry a DCI, and the DCI includes downlink scheduling information and uplink scheduling grant information. The downlink scheduling information includes downlink common scheduling information and downlink dedicated scheduling information. The downlink common scheduling information may refer to public messages, such as paging messages, system messages, and random access response messages, which are sent in the downlink. These public messages can be received by multiple UEs. The downlink dedicated scheduling information may refer to the dedicated data sent by the downlink, and is data for a specific UE, and other UEs do not need to receive.

Therefore, the PDCCH resource may include a CSS and a Dedicated Search Space (DSS). The UE may detect downlink common scheduling information in the CSS, and may also detect downlink dedicated scheduling information in the DSS according to its own identification information.

As shown in FIG. 1, an E-PDCCH may be added to a PDSCH resource, which may be used to extend an existing PDCCH. As shown in FIG. 1, the E-PDCCH and the PDSCH multiplex PDSCH resources in an FDM (Frequency Division Multiplex) manner. The E-PDCCH may also include CSS and DSS.

It should be understood that although only two parts of the E-PDCCH are described on the PDSCH resource in FIG. 1, the embodiment of the present invention is not limited to such a number, and the number of E-PDCCHs on the PDSCH resource is for the convenience of description. It may be less than such a number, or may be more than such a number.

2 is a schematic flow chart of a method of determining a location of a CSS, in accordance with an embodiment of the present invention. The method of Figure 2 is performed by a communication device, such as a UE or a base station. 210. Determine, according to the fixed resource mapping manner, a location of the CSS in the E-PDCCH on the PDSCH resource, or determine a location of the CSS in the E-PDCCH on the PDSCH resource according to the hopping resource mapping manner, where the fixed resource mapping manner The location of the CSS is indicated to be fixed, and the frequency hopping resource mapping manner indicates that the location of the CSS is changed.

In the prior art, after the UE accesses the network through the existing PDCCH, the base station notifies the UE of the location of the CSS in the E-PDCCH through the high layer signaling. However, for the network after LTE R11, there may be no existing PDCCH resources on the carrier, so that the base station cannot notify the location of the E-PDCCH through the high layer signaling for the initial access network or the UE in the idle state. In the embodiment of the present invention, since the resource mapping mode is predefined, the location of the E-PDCCH can be determined by a predefined resource mapping manner regardless of whether the base station and the UE are in a connected state or an idle state.

In the embodiment of the present invention, the E-PDCCH is indicated by a fixed resource mapping manner or a frequency hopping resource mapping manner.

The location of the CSS ensures that the communication device can determine the location of the CSS without the need for a parent. Optionally, as an embodiment, in step 210, N RBGs (Resource Block Groups) occupied by the CSS are continuously mapped on the PDSCH resources, where N is a positive integer. The communication device may obtain a predefined index of the first RBG occupied by the CSS, where the predefined index is an index of the mth RBG on the PDSCH resource, where m is a positive integer. Since the N RBGs occupied by the CSS are consecutive on the PDSCH resource, the index of the first RBG occupied by the CSS is obtained, and the location of the CSS on the PDSCH resource can be determined.

For example, a PDSCH resource allocation may be RBG granularity. The number of PRBs included in each RBG can be represented by N=. N = is related to the number of RBGs included in the downlink system bandwidth, such as when 64 ≤ N ≤ 110, N = = 4. Then the number M of RBGs on the PDSCH resource can be determined according to (1),

Generally, the number of PRBs occupied by the CSS N= can be predefined, where 0<N=<N. For example, the value of N= can be predefined as 2 or 3 or other values. The above numerical values are illustrative only and are not intended to limit the scope of the embodiments of the invention. Then, the number N of RBGs occupied by the CSS can be determined according to equation (2).

In addition, the number N of RBGs occupied by the CSS can also be predefined. For example, the number of RBGs that can be pre-defined by CSS can be 2 or 3 or other values. The above numerical values are illustrative only and are not intended to limit the scope of the embodiments of the invention.

Therefore, in the embodiment of the present invention, by fixing the location of the CSS on the PDSCH resource, it can be ensured that the communication device can determine the location of the CSS in the E-PDCCH without signaling interaction.

Optionally, as another embodiment, in step 210, the N RBGs occupied by the CSS are intermittently mapped on the PDSCH resource, where N is a positive integer. The communication device may obtain an index of the first RBG occupied by the CSS, and obtain a predefined interval s _n between the nth RBG and the nl) RBGs of the N RBGs occupied by the CSS, where n is a positive integer and 2≤ n ≤ N. The index I _n of the nth RBG occupied by the CSS may be determined according to the index of the first RBG and the interval s _n according to the equation (3).

I _n =I _n- i+s _n (3)

Where is the index of the (n-1)th RBG occupied by the CSS.

Since the RBGs occupied by the CSS are spaced apart on the PDSCH resources, the pre-defined between the first RBG of the CSS occupied by the CSS on the PDSCH resource and the two RBGs occupied by the CSS are obtained. The interval can be used to determine the location of the CSS.

Alternatively, as another embodiment, since the communication device may be a cell ID is common known, according to a cell identifier occupied CSS (Identification, ID), determining a first CSS occupied RBG index I _{l Q} 1st The determination of the index of the RBG does not need to be communicated through signaling.

In the embodiment of the present invention, by determining the location of the CSS by determining the location of the CSS by using the first RBG of the CSS occupied by the CSS according to the cell ID, interference between the cells can be reduced.

Optionally, in another step, in the step 210, the N RBGs occupied by the CSS in the first slot and the N RBGs occupied by the CSS in the second slot are respectively mapped on the PDSCH resources, and the first The frequency domain interval between the Xth RBG occupied by the CSS in the slot and the Xth RBG occupied by the CSS in the second slot is fixed, where N and X are positive integers, and l≤x≤N. The communication device may obtain the index Iu of the first RBG occupied by the CSS in the first time slot, and acquire the nth RBG and the (n-1)th RBG among the N RBGs occupied by the CSS in the first time slot. A predefined interval s _n , where n is a positive integer and 2 ≤ n ≤ N. According to the index In and the interval s _{n of the} first RBG, according to the equation (: determining the index I _ln of the nth RBG occupied by the CSS in the first slot,

Where Ι _{1 (η} _ _υ is the index of the nthth RBG occupied by the CSS in the first slot).

Then, a predefined frequency domain interval K _x between the Xth RBG occupied by the CSS in the first time slot and the Xth RBG occupied by the CSS in the second time slot may be obtained, where Κ _χ is a positive integer. According to a first time slot occupied by the X-th CSS RBG index, and frequency-domain interval I _lx Κ _χ, determine an index of the second CSS slot occupied by the X-th RBG _Ι 2χ. Therefore, in the embodiment of the present invention, by fixing the location of the CSS on the PDSCH resource, it can be ensured that the communication device can determine the location of the CSS in the E-PDCCH without signaling interaction.

Optionally, as another embodiment, the communications device may obtain an index Iu of the first RBG occupied by the CSS in the first time slot according to the cell ID.

Optionally, as another embodiment, in step 210, N RBGs occupied by the CSS in the yth subframe are continuously mapped on the PDSCH resource, where y is a positive integer. The communication device may determine the index I _{yl of the} first RBG occupied by the CSS in the yth subframe according to the subframe number y and/or the cell ID of the yth subframe.

For example, the communication device can determine the first RBG occupied by the CSS in the yth subframe according to the following equation

C―.” = N or, = 2 ⁹ - (y mod4) + N: cell

ID (10) where "mod" represents the modulo operation and y is the subframe number, f _h . _p (y) is the position index of the CSS in the yth subframe, f _m (y) is the random number obtained according to the subframe number, M is the number of positions of the CSS that can exist, and N is the cell identifier. Is a pseudo-random sequence function, and c _imt is the initialization value of the random sequence function. For example, in the FDD (Frequency Division Duplexing) system, c _mit = N ; in the TDD (Time Division Duplexing) system, c _mit = 2 ⁹ · (y mod 4) + .

It should be noted that the above equations (5) to (10) for determining the index I _yl of the first RBG occupied by the CSS in the yth subframe are merely examples for the purpose of helping the person skilled in the art to better understand the present. The invention is not intended to limit the scope of the embodiments of the invention. A person skilled in the art will be able to make various modifications or changes in accordance with the examples of the equations given, and such modifications or variations are also within the scope of the embodiments of the invention.

In the embodiment of the present invention, since the location of the CSS on the PDSCH resource is changed, the location of the CSS is determined according to the subframe number and/or the cell ID, so that the interference is randomized, so that the co-channel interference between the cells can be reduced.

Optionally, in another step, in step 210, the N RBGs occupied by the CSS in the first time slot in the yth subframe are continuously mapped on the PDSCH resource, and the first in the yth subframe. Second hour The N RBGs occupied by the CSS in the slot are continuously mapped on the PDSCH resource, and the frequency domain interval between the first RBG occupied by the CSS in the first slot and the first RBG occupied by the CSS in the second slot is fixed. Where y is a positive integer. The communication device may determine, according to the subframe number y of the yth subframe and the cell ID, an index I y11 of the first RBG occupied by the CSS in the first slot in the _{yth subframe} . A predefined frequency domain interval T between the first RBG occupied by the CSS in the first slot and the first RBG occupied by the CSS in the second slot may be obtained. The index I _{y21 of the} first RBG occupied by the CSS in the second slot may be determined according to the index I _y11 and the frequency domain interval T of the first RBG occupied by the CSS in the first slot.

For example, the communication device may also determine the index I _{yll of the} first RBG occupied by the CSS in the first slot in the yth subframe according to equations (5) to (10).

Since the first RBG occupied by the CSS in the first slot has a predefined frequency interval T between the first RBG occupied by the CSS in the second slot, the first RBG occupied by the CSS in the second slot The index I _y21 can be determined according to equation (11).

Optionally, as another embodiment, after the step 210, the communications device may use the CSS to send downlink common scheduling information of the UE to the UE. The communication device can be a service site, such as a base station. Specifically, when the communication device is a base station, when the base station needs to schedule the downlink common scheduling information, such as a paging message or a system message, the E-PDCCH may be determined on the PDSCH resource according to the fixed resource mapping manner or the frequency hopping resource mapping manner. The location of the CSS. After determining the CSS location, downlink common scheduling information may be sent to the UE within the CSS. When it is not necessary to schedule a downlink public message, the part of the resources occupied by the CSS can be used as a PDSCH resource for transmitting downlink data. The DCI carried in the CSS may be scrambled using a cell-specific scrambling code sequence. The reference signal set on the resource occupied by the CSS may be a cell-specific reference signal. Optionally, as another embodiment, after step 210, the communications device may detect downlink common scheduling information of the UE in the CSS. The communication device may be a terminal for obtaining downlink common scheduling information of the service site by detecting. Specifically, when the communication device is a UE, when the UE needs to detect the downlink common scheduling information, the location of the CSS in the E-PDCCH on the PDSCH resource may be determined according to the fixed resource mapping manner or the frequency hopping resource mapping manner, where the CSS is located in the CSS. Detect downlink common scheduling information. The UE may perform channel estimation by using a cell-specific reference signal in the CSS, and descramble the downlink common scheduling information in the CSS according to the cell-specific scrambling code sequence.

Embodiments of the present invention will be described in more detail below with reference to specific examples. It should be noted that the examples of FIGS. 3 through 5 are intended to assist those skilled in the art to better understand the embodiments of the present invention and are not intended to limit the scope of the embodiments of the present invention.

FIG. 3 is a schematic diagram of an example of a resource mapping manner of a CSS in an E-PDCCH according to an embodiment of the present invention. In FIG. 3, only CSS in the E-PDCCH is taken as an example for description.

In FIG. 3, it is assumed that the resource mapping mode is a fixed resource mapping mode, and the fixed resource mapping mode indicates that the location of the CSS on the PDSCH resource is fixed. The N RBGs occupied by the CSS are continuously mapped on the PDSCH resources, where N is a positive integer, and the value of N may be predefined or determined according to the equation (: 2:).

The communication device may determine the location of the CSS on the PDSCH resource by acquiring a predefined index of the first RBG occupied by the CSS on the PDSCH resource, where the predefined index may be an index of the mth RBG on the PDSCH resource, g卩The first RBG occupied by the CSS and the mth RBG on the PDSCH resource may be aligned, where m is a positive integer, and l ≤ m ≤ M, where M is the number of RBGs on the PDSCH resource, and the value of M may be in accordance with the equation. I) Make a determination.

As shown in FIG. 3, it is assumed that the index of the RBG on the PDSCH resource is numbered from 0, and the index is a positive integer, and the index of the mth RBG on the PDSCH resource is (1-1:). Assume that the m RBGs on the PDSCH resources and the mth RBGs on the PDSCH resources can be the RBGs in the center of the band on the PDSCH resources. The resource mapping mode of the CSS is shown in Figure 3. It should be noted that the above numerical values are only for exemplifying the embodiments of the present invention, and are not intended to limit the scope of the embodiments of the present invention.

It should be understood that although the number of RBGs occupied by the CSS on the PDSCH resource is an integer, the RBG part actually used by the CSS may not be an integer number of RBGs. For example, in FIG. 3, the CSS occupies 3 RBGs on the PDSCH resources, but the CSS is actually used. 2.5 RBGs. The above numerical values are only intended to illustrate the embodiments of the invention, and not to limit the scope of the embodiments of the invention.

It should be understood that the number of RBGs on the PDSCH resources described in FIG. 3 is only for the purpose of description. In the embodiment of the present invention, the number of RBGs on the PDSCH resources is not limited to the number, and the number of RBGs on the PDSCH resources is according to the downlink system. The number of PRBs included in the bandwidth is determined by the number of PRBs included in each RBG.

Therefore, in the embodiment of the present invention, by fixing the location of the CSS on the PDSCH resource, it can be ensured that the communication device can determine the location of the CSS in the E-PDCCH without signaling interaction. FIG. 4 is a schematic diagram of another example of a resource mapping manner of a CSS in an E-PDCCH according to an embodiment of the present invention. In FIG. 4, only the CSS in the E-PDCCH is taken as an example for description.

In FIG. 4, it is assumed that the resource mapping mode is a fixed resource mapping mode, and the fixed resource mapping mode indicates that the location of the CSS is fixed. The N RBGs occupied by the CSS are mapped on the PDSCH resources, where N is a positive integer. One

Specifically, in FIG. 4, it is assumed that the N RBGs occupied by the CSS are equally spaced on the PDSCH resource, and the interval s between every two RBGs of the N RBGs occupied by the BJS. M table

Shows the number of RBGs on the PDSCH resource. The value of M can be determined according to equation (I). The value of N can be predefined or determined according to equation (2;).

First, the communication device can acquire the first occupied by the CSS on the PDSCH resource according to the cell ID.

RBG index I _{l Q}

For example, the index of the first RBG occupied by the CSS on the PDSCH resource can be determined according to equation (12).

I, = N^ ^eU mod P (12)

Where is the cell ID, where P is the number of frequency domain offset positions of the CSS on the PDSCH resource. For example, when P=2, the CSS may have two offset positions on the PDSCH resource, and the two offset positions may be Predefined, such as the distance between the first offset position and the start of the frequency domain is Q1 PRB (or RBG), and the distance between the second offset position and the start of the frequency domain is Q2 PRB (or RBG), where Q1 ≠ Q2, Q1 and Q2 are positive integers. The value of P may be predefined, or may be determined by the base station, and notified to the UE through a PBCH (Physical Broadcast Channel) or an extended PBCH.

The index I _n of the nth RBG in the N RBGs occupied by the CSS on the PDSCH resource may be determined according to the equation (13).

Where l≤n≤N.

For example, if the CSS occupies 3 RBGs on the PDSCH resource, the index of the first RBG occupied by the CSS on the PDSCH resource is 1, and the interval between every two RBGs in the 3 RBGs is s=4, then the resources of the CSS are The mapping method is shown in Figure 4. The above numerical values are only intended to illustrate the embodiments of the present invention, and are not intended to limit the scope of the embodiments of the present invention.

It should be understood that the number of RBGs on the PDSCH resources described in FIG. 4 is only for the purpose of description. In the embodiment of the present invention, the number of RBGs on the PDSCH resources is not limited to the number, and the number of RBGs on the PDSCH resources is based on the downlink system bandwidth. The number of PRBs included is determined by the number of PRBs included in each RBG.

FIG. 5 is a schematic diagram of another example of a resource mapping manner of a CSS in an E-PDCCH according to an embodiment of the present invention. In FIG. 5, only CSS in the E-PDCCH is taken as an example for description. In FIG. 5, it is assumed that the resource mapping mode is a fixed resource mapping mode, and the fixed resource mapping mode indicates that the location of the CSS is fixed. N RBGs and second time slots occupied by CSS in the first time slot

The N RBGs occupied by the CSS are respectively mapped on the PDSCH resources, and the frequency domain interval between the Xth RBG occupied by the CSS in the first slot and the Xth RBG occupied by the CSS in the second slot is fixed. Wherein N and X are positive integers, and l ≤ x ≤ N. The value of N can be predefined or determined by equation (:2:).

In FIG. 5, it is assumed that the mapping manner of the RBGs occupied by the CSS in the first time slot and the second time slot on the PDSCH resources adopts the resource mapping manner described in FIG. 4, that is, the N occupied by the CSS in the first time slot. The RBGs are equally mapped on the PDSCH resources, and the N RBGs occupied by the CSS in the second slot are equally mapped on the PDSCH resources, where the RBGs occupied by the CSS in the first slot and the RBGs occupied by the CSS in the second slot There is a fixed frequency domain interval between them.

Assume that the interval between every two RBGs of N RBGs occupied by CS S in the first time slot s

M represents the number of RBGs on the PDSCH resource. The value of M can be determined according to equation (I).

First, the communication device can acquire the index Iu of the first RBG occupied by the CSS on the PDSCH resource in the first slot according to the cell ID.

For example, the index Iu of the first RBG occupied by the CSS on the PDSCH resource in the first slot may be determined according to equation (14),

I _n = N^ ^U mod P (14)

Where N is the cell ID, and P is the number of frequency domain offset positions of the CSS on the PDSCH resource. For example, when P=2, the CSS may have two offset positions on the PDSCH resource, and the two offset positions may be It is predefined. For example, the distance between the first offset position and the start of the frequency domain is Q1 PRB (or RBG), and the distance between the second offset position and the start of the frequency domain is Q2 PRB (or RBG). Where Q1 ≠ Q2, Ql and Q2 are positive integers. The value of P may be predefined or determined by the base station and notified to the UE via the PBCH or the extended PBCH.

The index I _lx of the xth RBG of the N RBGs occupied by the CSS on the PDSCH resource in the first time slot may be determined according to the equation (15).

_{_{I lx = I n + (xl}} ) xs (15)

In the first time slot, the Xth RBG occupied by the CSS on the PDSCH resource is in the second time slot.

The frequency domain interval 第 between the Xth RBGs occupied by the CSS on the PDSCH source is predefined, and the index I _2n of the nth RBG occupied by the CSS on the PDSCH resource in the slot may be according to the equation (16;).

It is assumed that the CSS of the PDSCH resource occupies 3 RBGs in the first time slot and the second time slot, and the index Iu of the first RBG occupied by the CSS on the PDSCH resource in the first time slot is 1, and every two of the three RBGs The interval s=3 between the water RBGs, the RBG occupied by the CSS in the first time slot and the second time slot The mapping method is shown in Figure 5. The above numerical values are only for exemplifying the embodiments of the present invention, and are not intended to limit the scope of the embodiments of the present invention.

It should be understood that the number of RBGs on the PDSCH resources described in FIG. 5 is only for the purpose of description. In the embodiment of the present invention, the number of RBGs on the PDSCH resources is not limited to the number, and the number of RBGs on the PDSCH resources may be according to the downlink system. The number of PRBs included in the bandwidth is determined by the number of PRBs included in each RBG.

6 is a schematic block diagram of a communication device in accordance with an embodiment of the present invention. The communication device 600 of Figure 6 can be either a UE or a base station. The communication device 600 includes an acquisition unit 610 and a determination unit 620. The acquisition unit 610 and determination unit 620 can be implemented by a processor.

The obtaining unit 610 obtains a fixed resource mapping manner or a frequency hopping resource mapping manner, where the fixed resource mapping manner indicates that the location of the CSS is fixed, and the frequency hopping resource mapping manner indicates that the location of the CSS is changed. The determining unit 620 determines the location of the CSS in the E-PDCCH on the PDSCH resource according to the fixed resource mapping manner, or determines the location of the CSS in the E-PDCCH on the PDSCH resource according to the hopping resource mapping manner.

In the embodiment of the present invention, the location of the CSS in the E-PDCCH is indicated by the fixed resource mapping mode or the frequency hopping resource mapping mode, so that the communication device can determine the location of the CSS without signaling interaction.

For other functions and operations of the device 600, reference may be made to the process of the method embodiment of the foregoing FIG. 2 to FIG. 5, and in order to avoid repetition, details are not described herein again.

Optionally, as an embodiment, the N resource block groups RBG occupied by the CSS are continuously mapped on the PDSCH resource, where N is a positive integer. The determining unit 620 may obtain a predefined index of the first RBG occupied by the CSS, where the predefined index may be an index of the mth RBG on the PDSCH resource, where m is a positive integer.

Therefore, in the embodiment of the present invention, by fixing the location of the CSS on the PDSCH resource, it can be ensured that the communication device can determine the location of the CSS in the E-PDCCH without signaling interaction. One

Optionally, as another embodiment, the N RBGs occupied by the CSS are intermittently mapped on the PDSCH resource, where N is a positive integer. The determining unit 620 may obtain the index of the first RBG occupied by the CSS, and obtain a predefined interval s _n between the nth RBG and the (nl)th RBG of the N RBGs occupied by the CSS, where n is a positive integer And 2≤n≤N _; according to the index of the first RBG and the interval s _n , the index I _n of the nth RBG occupied by the CSS is determined according to the equation I^I^+Sn, where the CSS is occupied (nl) ) an index of RBGs.

Optionally, as another embodiment, the determining unit 620 may determine the CSS occupation according to the cell ID. Index of the first RBG I _{l Q}

Optionally, as another embodiment, the N RBGs occupied by the CSS in the first time slot and the N RBGs occupied by the CSS in the second time slot are respectively mapped on the PDSCH resource, and the CSS is occupied by the CSS in the first time slot. The frequency domain interval between the Xth RBG and the Xth RBG occupied by the CSS in the second slot is fixed, where N and X are positive integers, and l≤x≤N. The determining unit 620 may obtain the index In of the first RBG occupied by the CSS in the first time slot, and acquire between the nth RBG and the 0-1)th RBG among the N RBGs occupied by the CSS in the first time slot. A predefined interval s _n , where n is a positive integer and 2 ≤ n ≤ N. The determining unit 620 may determine the index I _ln of the nth RBG occupied by the CSS in the first time slot according to the index In and the interval s _{n of the} first RBG according to the equation Ii _n =Ii( _n _i)+s ; Where 1^) is the cable of the (nl)th RBG occupied by the CSS in the first time slot. The determining unit 620 may obtain a predefined frequency domain interval K _x between the Xth RBG occupied by the CSS in the first time slot and the Xth RBG occupied by the CSS in the second time slot, where Κ _χ is a positive integer. The determination unit 620 in the first slot may be occupied by the X-th CSS RBG index, and frequency-domain interval I _lx Κ _χ, determining a second time slot occupied by the X-th CSS RBG index I _2x.

Optionally, as another embodiment, the determining unit 620 may obtain, according to the cell ID, an index Iu of the first RBG occupied by the CSS in the first time slot.

Optionally, as another embodiment, the N RBGs occupied by the CSS in the yth subframe are continuously mapped on the PDSCH resource, where y is a positive integer. The determining unit 620 may determine the index I _{yl of the} first RBG occupied by the CSS in the yth subframe according to the subframe number y and/or the cell ID of the yth subframe.

Optionally, as another embodiment, the N RBGs occupied by the CSS in the first time slot in the yth subframe are continuously mapped on the PDSCH resource, and the CSS is occupied in the second time slot in the yth subframe. The N RBGs are continuously mapped on the PDSCH resources, and the frequency domain interval between the first RBG occupied by the CSS in the first slot and the first RBG occupied by the CSS in the second slot is fixed, where y Is a positive integer. The determining unit 620 may determine, according to the subframe number y and/or the cell ID of the yth subframe, an index I y11 of the first RBG occupied by the CSS in the first slot in the _{yth subframe} . The determining unit 620 may acquire a predefined frequency domain interval T between the first RBG occupied by the CSS in the first slot and the first RBG occupied by the CSS in the second slot. The determining unit 620 may determine, according to the index I _y11 of the first RBG and the frequency domain interval T occupied by the CSS in the first time slot, the index Ι _ν2 ι of the first RBG occupied by the CSS in the second time slot. In the embodiment of the present invention, since the location of the CSS is changed on the PDSCH resource, the location of the CSS is determined according to the subframe number and/or the cell ID, so that the interference is randomized, so that the co-channel interference between the cells can be reduced.

FIG. 7 is a schematic block diagram of a communication device in accordance with another embodiment of the present invention. An example of device 700 of Figure 7 is a base station. In the device 700, the same or similar portions as those in Fig. 6 use the same reference numerals. In addition to the obtaining unit 610 and the determining unit 620, the device 700 further includes a transmitting unit 630. Transmitting unit 630 can be implemented by a transmitter.

The sending unit 630 sends the downlink common scheduling information of the UE to the UE by using the CSS.

In addition, in the embodiment of the present invention, by using the CSS on the PDSCH resource to send downlink common scheduling information to the UE, the resource utilization rate can be improved.

FIG. 8 is a schematic block diagram of a communication device in accordance with another embodiment of the present invention. An example of device 800 of Figure 8 is a UE. In the device 800, the same or similar portions as those of Fig. 6 or Fig. 7 are given the same reference numerals. In addition to the acquisition unit 610 and the determination unit 620, the device 800 further includes a detection unit 640.

The detecting unit 640 detects the downlink common scheduling information of the UE in the CSS.

In addition, in the embodiment of the present invention, by detecting the downlink common scheduling information in the CSS on the PDSCH resource, the resource utilization rate can be improved. Those of ordinary skill in the art will appreciate that the elements and algorithms of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again. In the several embodiments provided herein, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division, and the actual implementation may have another The manner of division, such as multiple units or components, may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. . The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should The scope of protection of the claims is subject to.

Claims

Rights request

A method for determining a location of a common search space CSS, the method comprising: determining, according to a fixed resource mapping manner, a location of a common search space CSS in an extended physical downlink control channel E-PDCCH on a physical downlink shared channel PDSCH resource Or,

Determining the location of the CSS in the E-PDCCH on the PDSCH resource according to the frequency hopping resource mapping manner,

The fixed resource mapping manner indicates that the location of the CSS is fixed, and the frequency hopping resource mapping manner indicates that the location of the CSS is changed.

The method according to claim 1, wherein the N resource block groups RBG occupied by the CSS are continuously mapped on the PDSCH resource, where N is a positive integer;

Determining, according to the fixed resource mapping manner, the location of the CSS in the E-PDCCH on the PDSCH resource, including:

Obtaining a predefined index of the first RBG occupied by the CSS, where the predefined index is an index of the mth RBG on the PDSCH resource, where m is a positive integer.

The method according to claim 1, wherein the N RBGs occupied by the CSS are intermittently mapped on the PDSCH resource, where N is a positive integer;

Obtaining an index of the first RBG occupied by the CSS, and acquiring a predefined interval s _n between the nth RBG and the 11th RBG of the N RBGs occupied by the CSS, where n is a positive integer and 2≤ n≤N;

Determining, according to the index of the first RBG and the interval s _n , an index I _n of the nth RBG occupied by the CSS according to the equation I^I+Sn, where the CSS is occupied by the Nl) Index of RBGs.

The method according to claim 3, wherein the acquiring an index of the first RBG occupied by the CSS includes:

Determining an index I _{l Q of the} first RBG occupied by the CSS according to the cell identifier

The method according to claim 1, wherein N RBGs occupied by the CSS in the first time slot and N RBGs occupied by the CSS in the second time slot are respectively mapped to the PDSCH at intervals The frequency domain interval between the Xth RBG occupied by the CSS in the first time slot and the Xth RBG occupied by the CSS in the second time slot is fixed, where N and X are fixed. Is a positive integer, and l ≤ x ≤ N;

Obtaining an index In of the first RBG occupied by the CSS in the first time slot, and acquiring an nth RBG and an OL RBG of the N RBGs occupied by the CSS in the first time slot a predefined interval s _n , where n is a positive integer and 2 ≤ n ≤ N;

According to the index In of the first RBG and the interval s _n , according to the equation Ι _1η = Ι _{1 (η} _ _υ + _δη Determining an index I _ln of the nth RBG occupied by the CSS in the first time slot, where )^) is an index of the nth) RBGs occupied by the CSS in the first time slot;

Obtaining a predefined frequency domain interval K _x between the Xth RBG occupied by the CSS in the first time slot and the Xth RBG occupied by the CSS in the second time slot, where Κ _χ a positive integer; in the first time slot in accordance with the X-th CSS occupied RBG index ₁₁ and the frequency-domain interval Κ _χ, determining said second time slot occupied by the X-th CSS The index of RBG is _2χ .

The method according to claim 5, wherein the acquiring the index In of the first RBG occupied by the CSS in the first time slot comprises:

Obtaining, according to the cell identifier, an index of the first RBG occupied by the CSS in the first time slot, Ιι ΐ ο

The method according to claim 1, wherein N RBGs occupied by the CSS in the yth subframe are consecutively mapped on the PDSCH resource, where y is a positive integer;

Determining, according to the hopping resource mapping manner, the location of the CSS in the E-PDCCH on the PDSCH resource, including:

Determining, according to the subframe number y and/or the cell identifier of the yth subframe, an index I _{yl of the} first RBG occupied by the CSS in the yth subframe.

The method according to claim 1, wherein, in the first time slot in the yth subframe, N RBGs occupied by the CSS are continuously mapped on the PDSCH resource, where the yth The N RBs occupied by the CSS in the second time slot in the subframe are continuously mapped on the PDSCH resource, and the first RBG and the second time occupied by the CSS in the first time slot The frequency domain interval between the first RBGs occupied by the CSS in the slot is fixed, where y is a positive integer;

Determining, according to the subframe number y and/or the cell identifier of the yth subframe, an index I y11 of the first RBG occupied by the CSS in the first slot in the _{yth subframe;}

Obtaining a predefined frequency domain interval T between the first RBG occupied by the CSS in the first time slot and the first RBG occupied by the CSS in the second time slot;

The index of the first time slot occupied by the CSS 1st _I yll RBG index and the frequency-domain interval T, determining the second time slot occupied by the CSS 1 RBG is the first I _y21 .

The method according to any one of claims 1 to 8, wherein in determining the

After the location of the CSS, it also includes:

And transmitting the downlink common scheduling information of the UE to the user equipment UE by using the CSS.

The method according to any one of claims 1 to 8, wherein after determining the location of the CSS, the method further comprises:

The downlink common scheduling information of the UE is detected in the CSS.

A communication device, comprising:

An acquiring unit, configured to acquire a fixed resource mapping manner or a frequency hopping resource mapping manner, where the fixed resource mapping manner indicates that the location of the CSS is fixed, and the frequency hopping resource mapping manner indication The location of the CSS is varied;

a determining unit, configured to determine, according to the fixed resource mapping manner, a physical downlink shared channel

The location of the common search space CSS in the E-PDCCH is extended on the PDSCH resource; or the location of the CSS in the E-PDCCH on the PDSCH resource is determined according to the frequency hopping resource mapping manner.

The device according to claim 11, wherein the N resource block groups RBG occupied by the CSS are continuously mapped on the PDSCH resource, where N is a positive integer;

The determining unit is specifically configured to acquire a predefined index of the first RBG occupied by the CSS, where the predefined index is an index of the mth RBG on the PDSCH resource, where m is a positive integer.

The device according to claim 11, wherein the N RBGs occupied by the CSS are intermittently mapped on the PDSCH resource, where N is a positive integer;

The determining unit is specifically configured to acquire an index of the first RBG occupied by the CSS, and acquire a predefined interval between the nth RBG and the (n-1)th RBG of the N RBGs occupied by the CSS. _n , where n is a positive integer and 2 ≤ n ≤ N _; according to the index of the first RBG and the interval s _n , the nth RBG occupied by the CSS is determined according to the equation I^I^+s Index I _n , where is the index of the (n-1)th RBG occupied by the CSS.

The device according to claim 13, wherein the determining unit is specifically configured to determine, according to the cell identifier, an index I _{l Q of the} first RBG occupied by the CSS.

The device according to claim 11, wherein N RBGs occupied by the CSS in the first time slot and N RBGs occupied by the CSS in the second time slot are respectively mapped to the PDSCH in an interval. The frequency domain interval between the Xth RBG occupied by the CSS in the first time slot and the Xth RBG occupied by the CSS in the second time slot is fixed, where N and X are fixed. Is a positive integer, and l ≤ x ≤ N;

The determining unit is specifically configured to acquire an index In of the first RBG occupied by the CSS in the first time slot, and acquire an nth of the N RBGs occupied by the CSS in the first time slot. a predefined interval s _n between the RBG and the nl) RBGs, where n is a positive integer and 2 ≤ n ≤ N;

_Determining , according to the index In of the first RBG and the interval s _n , an index of the nth RBG occupied by the CSS in the first slot according to an equation Ι _1η = Ι _{1 (η} _ _υ + _δη I _ln , where Ι^) is an index of the (n-1)th RBG occupied by the CSS in the first time slot; acquiring an Xth RBG and a location occupied by the CSS in the first time slot said second slot of said predefined CSS between the X-th RBG occupied frequency-domain interval _Κ χ, wherein _Κ χ is a positive integer; in the first time slot according to said first X occupies CSS _Ι 1χ RBG is index and the index of the frequency-domain interval Κ _χ, determining said second time slot occupied by the CSS of the X-th RBG _Ι 2χ.

The device according to claim 15, wherein the determining unit is configured to acquire, according to the cell identifier, an index Iu of the first RBG occupied by the CSS in the first time slot.

The device according to claim 11, wherein, in the yth subframe, N RBGs occupied by the CSS are continuously mapped on the PDSCH resource, where y is a positive integer; The determining unit is specifically configured to determine, according to the subframe number y and/or the cell identifier of the yth subframe, an index I _{yl of the} first RBG occupied by the CSS in the yth subframe.

The device according to claim 11, wherein, in the first time slot in the yth subframe, N RBGs occupied by the CSS are continuously mapped on the PDSCH resource, in the yth The N RBs occupied by the CSS in the second time slot in the subframe are continuously mapped on the PDSCH resource, and the first RBG and the second time occupied by the CSS in the first time slot The frequency domain interval between the first RBGs occupied by the CSS in the slot is fixed, where y is a positive integer;

The determining unit is specifically configured to determine, according to the subframe number y and/or the cell identifier of the yth subframe, the first RBG occupied by the CSS in the first time slot in the yth subframe Index I _yll; obtaining a predefined frequency domain interval T between the first RBG occupied by the CSS in the first time slot and the first RBG occupied by the CSS in the second time slot; The index 1^ of the first RBG and the frequency domain interval T occupied by the CSS in the first time slot determine an index I _{y21 of the} first RBG occupied by the CSS in the second time slot.

The device according to any one of claims 11 to 18, wherein the device further comprises:

And a sending unit, configured to send the downlink common scheduling information of the UE to the user equipment UE by using the CSS.

And a detecting unit, configured to detect downlink common scheduling information of the UE in the CSS.