WO2014117393A1

WO2014117393A1 - Resource mapping method and base station

Info

Publication number: WO2014117393A1
Application number: PCT/CN2013/071280
Authority: WO
Inventors: 张健; 莫斯利·蒂姆; 王轶; 张翼; 周华
Original assignee: 富士通株式会社
Priority date: 2013-02-01
Filing date: 2013-02-01
Publication date: 2014-08-07

Abstract

Embodiments of the present invention provide a resource mapping method and a base station. A cyclic shift value is selected by the base station for an orthogonal frequency division multiplexing (OFDM) symbol in which a channel state information-reference signal (CSI-RS) can occurs, and a cyclic shift is performed on a sequence number of an enhanced Resource Element (RE) group in the OFDM symbol according to the cyclic shift value, each enhanced Control Channel Element (eCCE) can be ensured to have nearly same number of RE in resource mapping, and the difference on downlink control information (DCI) transmission performance is reduced.

Description

Resource mapping method and base station

The present invention relates to the field of communications, and in particular, to a resource mapping method and a base station of an enhanced physical downlink control channel. The control channel is enhanced in LTE-A to meet the requirements of a new scenario such as a heterogeneous network, a multi-point cooperation, and a carrier aggregation, and is an Enhanced Physical Downlink Control Channel (EPDCCH).

In the current version of the 3GPP el.ll standard, the resource mapping of the EPDCCH is as follows: EPDCCH is transmitted in a Physical Downlink Shared Channel (PDSCH) area; a physical resource block pair (PRB pair) to be used for EPDCCH transmission Each of the enhanced control channel elements (eCCEs) consists of four or eight eREGs, that is, each PRB pair contains 4, which is divided into 16 enhanced resource element groups (eREGs). Or 2 eCCEs; within a PRB pair, the eREG sequence is mapped to all resource element (RE, Resource Element) resources that do not contain demodulation reference signals (DM-RS).

Figure 1 shows the eREG resource mapping in the case of a regular cyclic prefix (CP, Cyclic Prefix) sub-frame with 4 eREGs per eCCE. Figure 2 shows the mapping of eREG resources in the case of an eCCE with 8 eREGs in an extended CP subframe. All REs with the sequence number x in the figure constitute eREGx , where e {0,l,2,...,15}.

The resource mapping should ensure that each eCCE has the same number of REs as much as possible. Otherwise, the difference in transmission performance between different downlink control information (DCI, Downlink Control Information) will be caused. Ideally, each eCCE size (ie, the number of REs included) in Figure 1 is 36, 36, 36, 36, respectively.

However, the inventors have found that in existing solutions, in some cases (e.g., the presence of a reference signal) this balance will be broken, and resource mapping does not guarantee that each eCCE has the same number of REs.

It should be noted that the above description of the technical background is only for the purpose of facilitating a clear and complete description of the technical solutions of the present invention, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be well known to those skilled in the art simply because these solutions are set forth in the background section of the present invention. Summary of the invention

The embodiments of the present invention provide a resource mapping method and a base station, and the purpose is to ensure that each eCCE has almost the same number of REs when resource mapping is performed, and the difference in DCI transmission performance is reduced.

According to an aspect of the embodiments of the present invention, a resource mapping method is provided, which is applied to enhanced physical downlink control. Channel, the method includes:

The base station selects a cyclic shift value of {2, 3}, {3, 2}, {3, 4} or { for the enhanced resource particle group number in the OFDM symbol with sequence numbers 5 and 6 in the regular cyclic prefix subframe. 4, 3};

And mapping, in each physical resource block pair, the sequentially numbered enhanced resource particle group number to the resource particle except the demodulation reference signal, and according to the cyclic shift value, the OFDM symbol in the regular cyclic prefix subframe The enhanced resource particle group number is cyclically shifted.

According to another aspect of the present invention, a resource mapping method is provided, which is applied to an enhanced physical downlink control channel, where the method includes:

The base station selects a cyclic shift value of {2, 3}, {3, 2}, {3, 4} or { for the enhanced resource particle group number in the OFDM symbol with sequence numbers 12 and 13 in the regular cyclic prefix subframe. 4, 3};

And mapping, within each physical resource block pair, the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and according to the cyclic shift value, the OFDM symbol in the regular cyclic prefix subframe The enhanced resource particle group number is cyclically shifted.

The base station selects a first cyclic shift value and a second cyclic shift value respectively for the enhanced resource particle group number in the OFDM symbol with sequence numbers 9 and 10 in the regular cyclic prefix subframe; the first cyclic shift value and the first The absolute value of the difference between the two cyclic displacement values is an odd number between 0 and 12;

The base station selects a third cyclic shift value and a second cyclic shift value respectively for the enhanced resource particle group number in the OFDM symbol with sequence numbers 8 and 10 in the regular cyclic prefix subframe; the third cyclic shift value and the first The absolute value of the difference between the two cyclic displacement values is an odd number between 0 and 12;

The base station selects a fourth cyclic shift value and a fifth cyclic shift value respectively for the enhanced resource particle group number in the OFDM symbol with sequence numbers 4 and 5 in the extended cyclic prefix subframe; the fourth cyclic shift value and the first The absolute value of the difference between the five cyclic displacement values is an odd number between 0 and 12;

In each physical resource block pair, the sequentially numbered enhanced resource particle group number is mapped to the demodulation reference And a resource particle outside the signal, and cyclically shifting the sequence of the enhanced resource particle group in the OFDM symbol of the extended cyclic prefix subframe according to the cyclic shift value.

The base station selects a sixth cyclic shift value and a seventh cyclic shift value respectively for the enhanced resource particle group number in the OFDM symbol with sequence numbers 7 and 8 in the extended cyclic prefix subframe; the sixth cyclic shift value and the first The absolute value of the difference between the seven cyclic displacement values is an odd number between 0 and 12;

And mapping, within each physical resource block pair, the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and according to the cyclic shift value, the extended cyclic prefix subframe within the OFDM symbol The enhanced resource particle group number is cyclically shifted.

The base station selects an eighth cyclic shift value and a ninth cyclic shift value respectively for the enhanced resource particle group number in the OFDM symbol with sequence numbers 10 and 11 in the extended cyclic prefix subframe; the eighth cyclic shift value and the first The absolute value of the difference between the nine cyclic displacement values is an odd number between 0 and 12;

According to another aspect of the embodiments of the present invention, a base station is provided, where the base station includes:

The selection unit selects the cyclic displacement values {2, 3}, {3, 2}, {3, 4} for the enhanced resource particle group numbers in the OFDM symbols with sequence numbers 5 and 6 in the regular cyclic prefix subframe. Or {4, 3}; or, for the enhanced resource particle group number in the OFDM symbol with sequence numbers 12 and 13 in the regular cyclic prefix subframe, respectively, the cyclic displacement values are selected as {2, 3}, {3, 2}, {3, 4} or {4, 3}; or, for the enhanced resource particle group number in the OFDM symbol with sequence numbers 9, 10 in the regular cyclic prefix subframe, respectively selecting the first cyclic shift value And a second cyclic displacement value; an absolute value of the difference between the first cyclic displacement value and the second cyclic displacement value is an odd number between 0 and 12; or, for the conventional cyclic prefix subframe, the serial number is 8 The enhanced resource particle group number in the OFDM symbol of 10, respectively selecting the third cyclic shift value and the second cyclic shift value; the absolute value of the difference between the third cyclic shift value and the second cyclic shift value is 0. Odd to between 12; mapping unit, in each Within the physical resource block pair, the sequentially numbered enhanced resource particle group number is mapped to resource particles other than the demodulation reference signal, and the enhanced type in the OFDM symbol of the regular cyclic prefix subframe according to the cyclic shift value The resource particle group number is cyclically shifted.

a selecting unit, for selecting an enhanced resource particle group number in the OFDM symbol with sequence numbers 4 and 5 in the extended cyclic prefix subframe, respectively selecting a fourth cyclic shift value and a fifth cyclic shift value; the fourth cyclic shift value and the The absolute value of the difference between the fifth cyclic displacement values is an odd number between 0 and 12; or, before the expansion cycle An enhanced resource particle group number in an OFDM symbol with sequence numbers 7 and 8 in the suffix frame, respectively selecting a sixth cyclic shift value and a seventh cyclic shift value; the sixth cyclic shift value and the seventh cyclic shift value The absolute value of the difference is an odd number between 0 and 12; or, for the enhanced resource particle group number in the OFDM symbol with sequence numbers 10 and 11 in the extended cyclic prefix subframe, the eighth cyclic shift value is selected and a ninth cyclic displacement value; an absolute value of a difference between the eighth cyclic displacement value and the ninth cyclic displacement value is an odd number between 0 and 12.

a mapping unit, in each physical resource block pair, mapping the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and performing the extended cyclic prefix subframe OFDM according to the cyclic shift value The enhanced resource particle group number within the symbol is cyclically shifted.

According to another aspect of an embodiment of the present invention, a communication system is provided, the communication system comprising a base station as described above.

According to still another aspect of an embodiment of the present invention, a computer readable program is provided, wherein when the program is executed in a base station, the program causes a computer to perform a resource mapping method as described above in the base station.

According to still another aspect of an embodiment of the present invention, a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a resource mapping method as described above in a base station.

The beneficial effects of the embodiments of the present invention are: by selecting a cyclic shift value for an OFDM symbol in which a CSI-RS may occur, cyclically shifting the sequence of the enhanced resource particle group in the OFDM symbol according to the cyclic shift value, thereby ensuring each eCCE during resource mapping. Having almost the same number of REs, reducing the difference in DCI transmission performance Referring to the following description and the accompanying drawings, specific embodiments of the invention are disclosed in detail, and the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not limited in scope. The embodiments of the present invention include many variations, modifications, and equivalents within the scope of the spirit and scope of the appended claims.

Features described and/or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, in combination with, or in place of, features in other embodiments. .

It should be emphasized that the term "comprising" or "comprising" is used to mean the presence of a feature, component, step or component, but does not exclude the presence or addition of one or more other features, components, steps or components. DRAWINGS

Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not drawn to scale, but only to illustrate the principles of the invention. In order to facilitate the illustration and description of some parts of the invention, the corresponding parts in the drawings may be enlarged or reduced.

Elements and features described in one of the figures or one embodiment of the invention may be combined with elements and features illustrated in one or more other figures or embodiments. In the accompanying drawings, like reference numerals refer to the 1 is a schematic diagram of a conventional CP subframe in the prior art;

2 is a schematic diagram of an extended CP subframe in the prior art;

FIG. 3 is a diagram showing an example of an impact on eREG mapping in a 4-port CSI-RS configuration;

Figure 4 is a schematic diagram of the use of cyclic displacement in the prior art;

FIG. 5 is a flowchart of a resource mapping method according to Embodiment 1 of the present invention; FIG.

6 is a schematic diagram of an eREG position after performing cyclic shift according to Embodiment 1 of the present invention; FIG. 7 is another flowchart of a resource mapping method according to Embodiment 1 of the present invention;

8 is another flowchart of a resource mapping method according to Embodiment 1 of the present invention;

FIG. 9 is another schematic diagram of the eREG position after cyclic shift according to Embodiment 1 of the present invention; FIG. 10 is a schematic diagram of a CSI-RS position in a conventional CP subframe of frame structure type 2;

11 is another flowchart of a resource mapping method according to Embodiment 1 of the present invention;

FIG. 12 is another schematic diagram of the position of the eREG after cyclic shifting according to Embodiment 1 of the present invention; FIG. 13 is a schematic diagram of the position of the eREG after conditional combination according to Embodiment 1 of the present invention; FIG. 14 is a schematic diagram of the position of the eREG after the conditional combination of Embodiment 1 of the present invention; A flow chart of a resource mapping method;

15 is another flowchart of a resource mapping method according to Embodiment 2 of the present invention;

16 is another flowchart of a resource mapping method according to Embodiment 2 of the present invention;

Figure 17 is a schematic diagram showing the position of the eREG after the conditional combination of the embodiment 2 of the present invention; and Figure 18 is a block diagram showing the structure of the base station according to the third embodiment of the present invention. detailed description

The foregoing and other features of the invention will be apparent from the The specific embodiments of the present invention are disclosed in the specification and the drawings, which are illustrated in the embodiments of the invention The invention includes all modifications, variations and equivalents falling within the scope of the appended claims.

In some cases, such as channel state information reference signals (CSI-RS, Channel State Information)

In the case of a Reference Symbol, resource mapping may not guarantee that each eCCE has the same number of REs.

Figure 3 is a diagram showing an example of the impact on eREG mapping in a 4-port CSI-RS configuration. As shown in FIG. 3, a 4-port CSI-RS (4-port CSI-RS) appears in a regular CP subframe. Since the RE occupied by the CSI-RS cannot be used by the EPDCCH, the size of the eCCEO to eCCE3 becomes 36. 34, 36, 34, thus making the eCCE size unbalanced.

In order to obtain a relatively balanced eCCE size as much as possible, a cyclic shift can be introduced for each OFDM symbol based on the current eREG/eCCE partition. For example, let the cyclic shift equal the number of the OFDM symbol.

Figure 4 is a schematic illustration of the use of cyclic displacement in the prior art. As shown in Figure 4, the value of the cyclic displacement here The range is 0~11. The method can ensure that the REs used by each 2-port CSI-S are from two different eCCEs, so that the eCCE size imbalance problem can be alleviated to some extent. However, for 4-port CSI-RS configurations, there is still an eCCE imbalance. For example, as shown in FIG. 4, in the 4-port CSI-RS configuration, the number of REs included in eCCEO to lj eCCE3 is 36, 34, 34, 36 in order, so there is still room for optimization.

It is worth noting that the above existing problems are only exemplified by conventional CP subframes, and similar problems exist for extended CP subframes. The present invention will be described in detail below. Regardless of the 2-port CSI-RS or the 4-port CSI-RS, the present invention can ensure that each eCCE has the same number of REs. Example 1

The embodiment of the invention provides a resource mapping method, which is applied to resource mapping of an EPDCCH. The embodiment of the present invention uses a conventional CP subframe as an example to describe the resource mapping method of the present invention in detail.

FIG. 5 is a flowchart of a resource mapping method according to an embodiment of the present invention. As shown in FIG. 5, the method includes: Step 501: An enhanced type in an OFDM symbol with sequence numbers 5 and 6 in a regular cyclic prefix subframe. Resource particle group number, select the cyclic displacement value as {2, 3} or {3, 2}, or {3, 4}, or {4, 3} respectively;

Step 502: In each physical resource block pair, map the sequentially numbered enhanced resource particle group number to the resource particle except the demodulation reference signal, and then perform enhancement on the regular cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

In this embodiment, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers may be mapped to resource particles other than the DM-RS in the order of the prior frequency. For the OFDM symbol number in a regular CP subframe, it can be divided into 14 columns from 0 to 13, and each column includes 12 REs. For resource particles in OFDM symbols with sequence numbers 5 and 6, a portion is occupied by the DMRS. The specific content can refer to the prior art.

In this embodiment, for OFDM symbols of sequence numbers 5 and 6, the cyclic shift values can be selected separately. The selected cyclic shift value can be {2, 3} or {3, 2}, or {3, 4}, or {4, 3}. For example, if the enhanced resource particle group number in the OFDM symbol with sequence number 5 selects a cyclic shift value of 2, the enhanced resource particle group number in the OFDM symbol with sequence number 6 may select a cyclic shift value of 3; or, the sequence number is The enhanced resource particle group number selection within the OFDM symbol of 5 selects a cyclic shift value of 4, and the enhanced resource particle group number in the OFDM symbol with sequence number 6 can select a cyclic shift value of 3.

In this embodiment, the base station may cyclically shift the sequence number of the enhanced resource particle group in some OFDM symbols of the regular CP subframe according to the selected cyclic shift value. Wherein, for the OFDM symbols with sequence numbers 5 and 6, the available resource particles are resource particles other than the DMRS occupying resource particles. The enhanced resource particle group number is mapped to the available resource particles, and then the enhanced resource particle group number is cyclically shifted according to the selected cyclic displacement value.

Moreover, the existing cyclic shift value may be used for the enhanced resource particle group sequence number in other OFDM symbols, and details are not described herein again. Then, the EPDCCH resource is performed according to the determined eREG position after the displacement. Mapping. Specific details regarding available resource particles, cyclic shifts, and resource mapping can be found in the prior art. FIG. 6 is a schematic diagram of the eREG position after cyclic shift according to an embodiment of the present invention. For simplicity, only the available resource particles in the OFDM symbols with sequence numbers 5 and 6 are shown, and the resource particles occupied by the DMRS are not shown. As shown in Figure 6, the box shows the possible locations of the CSI-RS.

As shown in Fig. 6, in the case of (A), the OFDM symbol of sequence number 5 has a cyclic shift value of 2, and the OFDM symbol of sequence number 6 has a cyclic shift value of 3. (B) In the case, the OFDM symbol number 5 has a cyclic shift value of 3, and the OFDM symbol number 6 has a cyclic shift value of 2. In the case of (C), the OFDM symbol number 5 has a cyclic shift value of 3, and the OFDM symbol number 6 has a cyclic shift value of 4. (D) In the case, the OFDM symbol with sequence number 5 has a cyclic shift value of 4, and the OFDM symbol with sequence number 6 has a cyclic shift value of 3.

The above method differs from the method shown in FIG. 4 in that the four REs used by the 4-port CSI-RS in FIG. 4 are only from two different eCCEs (eCCEl, eCCE2), and the method of FIG. 5 can satisfy each 4- The port CSI-RS occupies REs from 4 different eCCEs. Therefore, for a configuration in which the PRB pair includes four eCCEs, the present invention comprehensively considers the influence of the 4-port CSI-RS condition on the eCCE size when selecting the cyclic shift.

FIG. 7 is another flowchart of a resource mapping method according to an embodiment of the present invention. As shown in FIG. 7, the method includes: Step 701: A base station enhances an OFDM symbol with sequence numbers 12 and 13 in a regular cyclic prefix subframe. Type resource particle group number, select the cyclic displacement value as {2, 3} or {3, 2}, or {3, 4}, or {4, 3} respectively;

Step 702: In each physical resource block pair, map the sequentially numbered enhanced resource particle group sequence number to resource particles other than the demodulation reference signal, and then perform enhancement on the regular cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

In the present embodiment, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers may be mapped to resource particles other than the DM-RS in the order of the pre-frequency. Similar to the method shown in FIG. 5, for OFDM symbols of sequence numbers 12 and 13, it is also possible to select a cyclic shift value of {2, 3} or {3, 2}, or {3, 4}, or {4, 3, respectively. }.

FIG. 8 is another flowchart of the resource mapping method according to the embodiment of the present invention. As shown in FIG. 8, the method includes: Step 801: The base station is in an OFDM symbol with sequence numbers 9 and 10 in a regular cyclic prefix subframe. An enhanced resource particle group number, respectively selecting a first cyclic displacement value and a second cyclic displacement value; wherein an absolute value of a difference between the first cyclic displacement value and the second cyclic displacement value is an odd number between 0 and 12;

Step 802: In each physical resource block pair, map the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and then perform enhancement on the regular cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

In this embodiment, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers may be mapped to resource particles other than the DM-RS in the order of the pre-frequency. Assuming that the cyclic displacements used by the OFDM symbols with the sequence numbers of 9, 10 are x and y, respectively, the absolute difference between x and y is the set {1, The elements in 3, 5, 7, 9, 11}, that is, the absolute difference of the cyclic displacement is an odd number in the range of 0~12. For example, x=0, y=5 _; or x=2, y=9, and so on.

Figure 9 is another schematic diagram of the eREG position after cyclic shifting in accordance with an embodiment of the present invention, wherein for simplicity, only available resource particles within the OFDM symbols of sequence numbers 9, 10 are shown. Figure 9 shows an example of the cyclic shift of the eREG sequence number in the OFDM symbol with sequence numbers 9, 10. As shown in FIG. 9, the cyclic shift values used by the OFDM symbols of sequence numbers 9, 10 may be 0, 1 respectively; or 0, 3; or 0, 5; or 0, 7; or 0, 9 ; or 0, 11. It is to be noted that Fig. 9 only schematically shows the case of the cyclic displacement, but the invention is not limited thereto.

In the present embodiment, the CSI-RS considered above is applicable to the frame structure type 1 and the frame structure type 2. 10 is a schematic diagram of CSI-RS locations in a regular CP subframe of frame structure type 2, and for a CSI-RS only for frame structure type 2, a possible CSI-RS location is shown in FIG. As shown in FIG. 10, if the cyclic shift is determined according to the OFDM symbol number, it can be seen from FIG. 10 that the RE occupied by the 4-port CSI-RS is only from two different eCCEs, and thus the ideal effect is not achieved.

FIG. 11 is another flowchart of a resource mapping method according to an embodiment of the present invention. As shown in FIG. 11, the method includes:

Step 1101: The base station selects a third cyclic shift value and a second cyclic shift value for the eREG sequence numbers in the OFDM symbols with sequence numbers 8 and 10 in the regular cyclic prefix subframe, where the third cyclic shift value and the second cyclic shift value are respectively selected. The absolute value of the difference is an odd number between 0 and 12.

Step 1102: In each physical resource block pair, map the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and then perform enhancement on the regular cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

In this embodiment, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers may be mapped to resource particles other than the DM-RS in the order of the pre-frequency. To adapt to the CSI-RS case only for frame structure type 2, the following conditions can also be added: Assuming that the cyclic displacement used by the OFDM symbols 8, 10 is 2, y, the absolute value of the difference between ₂ and y is a set. Elements in {1, 3, 5, 7, 9, 11}.

FIG. 12 is another schematic diagram of the eREG position after cyclic shift according to an embodiment of the present invention. As shown in FIG. 12, the eCCE mapping may use a cyclic shift of 3 for each OFDM symbol (symbols 8, 10) that may occur in the CSI-RS. 0, that is, the condition described in FIG. 11 is satisfied.

As shown in Figure 12, the REs occupied by any 4-port CSI-RS are derived from 4 different eCCEs, so the above conditions are used to constrain the eCCE size.

It should be noted that the above only describes the cyclic shift of the eREG sequence number of the OFDM symbol number 5, 6, or 12, 13, or 9, 10, or 8, 10 respectively. In a specific implementation, the cyclic shift may be performed in combination with several or all of the cases. For the eREG sequence number of other OFDM symbols, the prior art may be used, and a specific implementation manner may be determined according to actual conditions.

FIG. 13 is a schematic diagram of an eREG position after conditional combination according to an embodiment of the present invention. As shown in Figure 13 It is shown that for OFDM symbols (5, 6, 12, 13, 8, 9, 10) that may occur in CSI-RS, the cyclic shift selection satisfies the conditions in Figs. 5, 7, 8, and 11.

That is, as described in the condition of FIG. 5, the OFDM symbol number 5 has a cyclic shift value of 3, and the sequence number is

The OFDM symbol selection of 6 has a cyclic shift value of 2. As shown in the condition in Fig. 7, the OFDM symbol numbered 12 has a cyclic shift value of 2, and the OFDM symbol number 13 has a cyclic shift value of 3. As described in the condition of Fig. 8, the OFDM symbol with sequence number 9 has a cyclic shift value of 1, and the OFDM symbol with sequence number 10 has a cyclic shift value of 0, and the absolute value of the difference between the two is 1. As described in the conditions in Figure 11, the serial number is 8.

The OFDM symbol selection cyclic shift value is 3, the OFDM symbol numbered 10 has a cyclic shift value of 0, and the absolute value of the difference between the two is 3.

As shown in FIG. 13, the resource particles corresponding to the OFDM symbols (for example, 0, 1, 2, 3, 4, 11) in which no CSI-RS occurs may still be selected according to the cyclic shift equal to the OFDM symbol number. For the OFDM symbol with sequence number 7, as shown in Figure 13, the cyclic shift value can be chosen to be 8.

It is worth noting that the above description is only given by taking 4-port CSI-RS as an example, for 2-port

The present invention is still applicable to CSI-RS and the like. For a configuration in which each PRB pair contains 2 eCCEs, the present invention is also applicable.

Therefore, for the resource mapping method that satisfies the conditions in FIG. 5, 7, 8, and 11, it can be guaranteed that: the RE used in the 2-port CSI-RS is from two different eCCEs; the RE used in the 4-port CSI-RS is from four different The eCCE; 8-port CSI-RS uses RE from 4 different eCCEs. This makes it possible to obtain an eCCE size that is as uniform as possible.

It can be seen from the foregoing embodiment that by selecting a cyclic shift value for an OFDM symbol in which a CSI-RS may occur, cyclic shifting the eREG sequence according to the cyclic shift value ensures that each eCCE has almost the same number of REs during resource mapping, thereby reducing DCI transmission performance. The difference. Example 2

The embodiment of the invention provides a resource mapping method, which is applied to resource mapping of an EPDCCH. The resource mapping method of the present invention is described in detail in the embodiment of the present invention by using the extended CP subframe as an example, and the same content as the first embodiment will not be described again.

FIG. 14 is a flowchart of a resource mapping method according to an embodiment of the present invention. As shown in FIG. 14, the method includes: Step 1401: For an eREG sequence number in an OFDM symbol with sequence numbers 4 and 5 in an extended cyclic prefix subframe, Selecting a fourth cyclic displacement value and a fifth cyclic displacement value respectively; wherein an absolute value of a difference between the fourth cyclic displacement value and the fifth cyclic displacement value is an odd number between 0 and 12;

Step 1402: In each physical resource block pair, map the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and then perform enhancement on the extended cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

FIG. 15 is another flowchart of a resource mapping method according to an embodiment of the present invention. As shown in FIG. 15, the method includes: Step 1501: A base station selects an eREG in an OFDM symbol with sequence numbers 7 and 8 in an extended cyclic prefix subframe. a serial number, a sixth cyclic displacement value and a seventh cyclic displacement value are respectively selected; wherein an absolute value of a difference between the sixth cyclic displacement value and the seventh cyclic displacement value is an odd number between 0 and 12;

Step 1502: In each physical resource block pair, map the sequentially numbered enhanced resource particle group number to resource particles other than the demodulation reference signal, and then perform enhancement on the extended cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

FIG. 16 is another flowchart of the resource mapping method according to the embodiment of the present invention. As shown in FIG. 16, the method includes: Step 1601: The base station selects an eREG sequence number in an OFDM symbol with sequence numbers 10 and 11 in an extended cyclic prefix subframe. And selecting an eighth cyclic displacement value and a ninth cyclic displacement value respectively; wherein an absolute value of a difference between the eighth cyclic displacement value and the ninth cyclic displacement value is an odd number between 0 and 12;

Step 1602: In each physical resource block pair, map the sequentially numbered enhanced resource particle group number to the resource particle except the demodulation reference signal, and then perform enhancement on the extended cyclic prefix subframe OFDM symbol according to the cyclic shift value. The type of the resource particle group is cyclically shifted.

In this embodiment, in step 1402, step 1502 or step 1602, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers may be mapped to the DM in the order of the prior frequency. - Resource particles outside the RS.

In this embodiment, for the extended CP, since each PRB pair contains only two eCCEs, RE resources from two different eCCEs can be used as long as any CSI-RS configuration is satisfied. For CSI-RSs applicable to Frame Structure Type 1 and Frame Structure Type 2, the possible OFDM symbols are 4, 5, 10, 11; for CSI-RS only applicable to Frame Structure Type 2, its possible OFDM The symbols are 7, 8. Therefore, satisfying the conditions in Fig. 14, 15 or 16, it is guaranteed that each eCCE has the same number of REs when the resource is mapped.

It is worth noting that the above only describes the cyclic shift of the eREG sequence number in the OFDM symbol with sequence numbers 4, 5, or 7, 8, or 10, 11. In a specific implementation, cyclic shifts may be performed in combination with several or all of them. For the eREG sequence numbers of other OFDM symbols, the prior art may be used, and specific implementation manners may be determined according to actual conditions.

17 is a schematic diagram of resource particles after conditional combination according to an embodiment of the present invention. As shown in Fig. 17, for the OFDM symbols (4, 5, 7, 8, 10, 11) that may appear in the CSI-RS, the cyclic shift selection satisfies the conditions in Figs. 14, 15, and 16.

It can be seen from the foregoing embodiment that by selecting a cyclic shift value for an OFDM symbol in which a CSI-RS may occur, cyclic shifting the eREG sequence according to the cyclic shift value ensures that each eCCE has almost the same number of REs during resource mapping, thereby reducing DCI transmission performance. The difference. Example 3

The embodiment of the present invention provides a base station, which corresponds to the method described in Embodiment 1 or 2, and the same content is not described again.

FIG. 18 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 18, the base station 1800 includes: The unit 1801 and the mapping unit 1802 are selected. Other parts of the base station 1800 can refer to the prior art.

In an embodiment, for a regular CP subframe, the selecting unit 1801 selects cyclic shift values of {2, 3}, {3, 2 for the eREG sequence numbers in the OFDM symbols of sequence numbers 5 and 6 in the regular CP subframe, respectively. }, {3, 4} or {4, 3};

Or, for the eREG sequence numbers in the OFDM symbols with sequence numbers 12 and 13 in the regular CP subframe, respectively, the cyclic shift values are selected as {2, 3}, {3, 2}, {3, 4}, or {4, 3}. ;

Or, for the eREG sequence number in the OFDM symbol with sequence numbers 9 and 10 in the regular CP subframe, respectively selecting the first cyclic shift value and the second cyclic shift value; wherein the difference between the first cyclic shift value and the second cyclic shift value is The absolute value is an odd number between 0 and 12;

Or, for the eREG sequence number in the OFDM symbol with the sequence number of 8, 10 in the regular CP subframe, the third cyclic shift value and the second cyclic shift value are respectively selected; wherein the difference between the third cyclic shift value and the second cyclic shift value is The absolute value is an odd number between 0 and 12;

The mapping unit 1802 maps, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers to the resource particles except the demodulation reference signal in the order of the first frequency and then the regular CP according to the cyclic displacement value. The enhanced resource particle group number within the frame OFDM symbol is cyclically shifted.

In another embodiment, for the extended CP subframe, the selecting unit 1801 selects a fourth cyclic shift value and a fifth cyclic shift value respectively for the eREG sequence numbers in the OFDM symbols of sequence numbers 4 and 5 in the extended CP subframe; The absolute value of the difference between the fourth cyclic shift value and the fifth cyclic shift value is an odd number between 0 and 12; or, for the eREG sequence number in the OFDM symbol of sequence number 7, 8 in the extended CP subframe, respectively, the sixth is selected. a cyclic displacement value and a seventh cyclic displacement value; wherein an absolute value of a difference between the sixth cyclic displacement value and the seventh cyclic displacement value is an odd number between 0 and 12;

Or, for the eREG sequence numbers in the OFDM symbols with sequence numbers 10 and 11 in the extended CP subframe, respectively selecting an eighth cyclic shift value and a ninth cyclic shift value; wherein the eighth cyclic shift value and the ninth cyclic shift value are The absolute value of the difference is an odd number between 0 and 12.

The mapping unit 1802 maps, in each physical resource block pair, all sequentially numbered enhanced resource particle group numbers to resource particles other than the demodulation reference signal in the order of the first frequency, and then expands the CP according to the cyclic displacement value. The enhanced resource particle group number within the frame OFDM symbol is cyclically shifted.

It can be seen from the foregoing embodiment that by selecting a cyclic shift value for an OFDM symbol in which a CSI-RS may occur, cyclic shifting of the eREG sequence in each OFDM symbol according to the cyclic shift value ensures that each eCCE has almost the same number of REs during resource mapping. , reduce the difference in DCI transmission performance.

The embodiment of the present invention further provides a communication system, which includes the base station as described in Embodiment 3. The embodiment of the present invention further provides a computer readable program, wherein when the program is executed in a base station, the program causes a computer to execute the resource mapping method as described in Embodiment 1 or 2 above in the base station.

An embodiment of the present invention further provides a storage medium storing a computer readable program, wherein the computer readable program causes a computer to perform a resource mapping method as described in Embodiment 1 or 2 above in a base station. The above apparatus and method of the present invention may be implemented by hardware, or may be implemented by hardware in combination with software. The present invention relates to a computer readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to cause the logic component to implement the various methods described above Or steps. The present invention also relates to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like.

One or more of the functional blocks described in the figures and/or one or more combinations of functional blocks may be implemented as a general purpose processor, digital signal processor (DSP) for performing the functions described herein. An application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof. One or more of the functional blocks described with respect to the figures and/or one or more combinations of functional blocks may also be implemented as a combination of computing devices, eg, a combination of a DSP and a microprocessor, multiple microprocessors One or more microprocessors in conjunction with DSP communication or any other such configuration.

The present invention has been described in connection with the specific embodiments thereof, and it should be understood by those skilled in the art that these descriptions are not intended to limit the scope of the invention. A person skilled in the art can make various modifications and changes to the invention in accordance with the spirit and the principles of the invention, which are also within the scope of the invention.

Claims

claims

1. A resource mapping method, applied to the enhanced physical downlink control channel. The method includes: The base station selects cyclically selected enhanced resource particle group sequence numbers in OFDM symbols with sequence numbers 5 and 6 in the conventional cyclic prefix subframe. The displacement value is {2, 3}, {3, 2}, {3, 4} or {4, 3};

Within each physical resource block pair, the sequentially numbered enhanced resource element group sequence number is mapped to the resource elements except the demodulation reference signal, and the regular cyclic prefix subframe OFDM symbol is mapped according to the cyclic displacement value. The enhanced resource particle group sequence number is cyclically displaced.

2. The method according to claim 1, wherein the method further includes:

The base station selects cyclic displacement values of {2, 3}, {3, 2}, and {3, respectively, for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 12 and 13 in the conventional cyclic prefix subframe. 4} or {4, 3}.

3. The method according to claim 1 or 2, wherein the method further includes:

The base station selects a first cyclic displacement value and a second cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with serial numbers 9 and 10 in the regular cyclic prefix subframe; the first cyclic displacement value The absolute value of the difference from the second cyclic displacement value is an odd number between 0 and 12.

4. The method according to claim 1 or 2, wherein the method further includes:

The base station selects a third cyclic displacement value and a second cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with serial numbers 8 and 10 in the regular cyclic prefix subframe; the third cyclic displacement value The absolute value of the difference from the second cyclic displacement value is an odd number between 0 and 12.

5. The method according to claim 3, wherein the method further includes:

The base station selects a third cyclic displacement value for the enhanced resource particle group sequence number in the OFDM symbol with sequence number 8 in the regular cyclic prefix subframe; the third cyclic displacement value and the second cyclic displacement value The absolute value of the difference is an odd number between 0 and 12.

6. A resource mapping method, applied to the enhanced physical downlink control channel, the method includes: the base station selects cyclically respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 12 and 13 in the conventional cyclic prefix subframe. The displacement value is {2, 3}, {3, 2}, {3, 4} or {4, 3};

Within each physical resource block pair, the sequentially numbered enhanced resource element group sequence number is mapped to the resource element except the demodulation reference signal, and the cyclic prefix subframe OFDM symbol within the regular cyclic prefix subframe is mapped according to the cyclic displacement value. The sequence number of the enhanced resource particle group undergoes cyclic displacement.

7. The method according to claim 6, wherein the method further includes:

The base station selects cyclic displacement values of {2, 3}, {3, 2}, and {3, respectively, for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 5 and 6 in the conventional cyclic prefix subframe. 4} or {4, 3}.

8. The method according to claim 6 or 7, wherein the method further includes:

9. The method according to claim 6 or 7, wherein the method further includes:

10. The method according to claim 8, wherein the method further includes:

11. A resource mapping method, applied to the enhanced physical downlink control channel, the method includes: the base station selects the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 9 and 10 in the conventional cyclic prefix subframe, respectively. a cyclic displacement value and a second cyclic displacement value; the absolute value of the difference between the first cyclic displacement value and the second cyclic displacement value is an odd number between 0 and 12;

12. The method according to claim 11, wherein the method further includes:

13. The method according to claim 11 or 12, wherein the method further includes:

14. The method according to claim 11 or 12, wherein the method further includes:

15. The method according to claim 13, wherein the method further includes:

16. A resource mapping method, applied to the enhanced physical downlink control channel, the method includes: the base station selects the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 8 and 10 in the conventional cyclic prefix subframe, respectively. The third cyclic displacement value and the second cyclic displacement value; the absolute value of the difference between the third cyclic displacement value and the second cyclic displacement value is an odd number between 0 and 12;

Within each physical resource block pair, map the sequentially numbered enhanced resource particle group sequence number to the demodulation reference Resource elements outside the signal, and perform cyclic displacement on the enhanced resource element group sequence number in the regular cyclic prefix subframe OFDM symbol according to the cyclic displacement value.

17. The method according to claim 16, wherein the method further includes:

18. The method according to claim 16 or 17, wherein the method further includes:

19. The method according to claim 16 or 17, wherein the method further includes:

The base station selects a first cyclic displacement value for the enhanced resource particle group sequence number in the OFDM symbol with sequence number 9 in the regular cyclic prefix subframe; the first cyclic displacement value and the second cyclic displacement value The absolute value of the difference is an odd number between 0 and 12.

20. The method according to claim 18, wherein the method further includes:

The base station selects a first cyclic displacement value for the enhanced resource particle group sequence number in the OFDM symbol with a sequence number of 9 in the regular cyclic prefix subframe; the first cyclic displacement value and the second cyclic displacement value The absolute value of the difference is an odd number between 0 and 12.

21. A resource mapping method, applied to the enhanced physical downlink control channel, the method includes: the base station selects the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 4 and 5 in the extended cyclic prefix subframe, respectively. The fourth cyclic displacement value and the fifth cyclic displacement value; the absolute value of the difference between the fourth cyclic displacement value and the fifth cyclic displacement value is an odd number between 0 and 12;

Within each physical resource block pair, the sequentially numbered enhanced resource element group sequence numbers are mapped to resource elements other than the demodulation reference signal, and the elements within the extended cyclic prefix subframe OFDM symbol are mapped according to the cyclic displacement value. The sequence number of the enhanced resource particle group undergoes cyclic displacement.

22. The method according to claim 21, wherein the method further includes:

The base station selects a sixth cyclic displacement value and a seventh cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with serial numbers 7 and 8 in the extended cyclic prefix subframe; the sixth cyclic displacement value The absolute value of the difference from the seventh cyclic displacement value is an odd number between 0 and 12.

23. The method according to claim 21 or 22, wherein the method further includes:

The base station selects an eighth cyclic displacement value and a ninth cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with serial numbers 10 and 11 in the extended cyclic prefix subframe; the eighth cyclic displacement value The absolute value of the difference from the ninth cyclic displacement value is an odd number between 0 and 12.

24. A resource mapping method, applied to the enhanced physical downlink control channel, the method includes: the base station selects the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 7 and 8 in the extended cyclic prefix subframe, respectively. Sixth cycle displacement value and seventh cycle displacement value; The absolute value of the difference between the sixth cycle displacement value and the seventh cycle displacement value is an odd number between 0 and 12; Within each physical resource block pair, the sequentially numbered enhanced resource element group sequence numbers are mapped to resource elements other than the demodulation reference signal, and the elements within the extended cyclic prefix subframe OFDM symbol are mapped according to the cyclic displacement value. The sequence number of the enhanced resource particle group undergoes cyclic displacement.

25. The method according to claim 24, wherein the method further includes:

The base station selects a fourth cyclic displacement value and a fifth cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 4 and 5 in the extended cyclic prefix subframe; the fourth cyclic displacement value The absolute value of the difference from the fifth cyclic displacement value is an odd number between 0 and 12.

26. The method according to claim 24 or 25, wherein the method further includes:

27. A resource mapping method, applied to the enhanced physical downlink control channel, the method includes: the base station selects the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 10 and 11 in the extended cyclic prefix subframe respectively. The eighth cyclic displacement value and the ninth cyclic displacement value; the absolute value of the difference between the eighth cyclic displacement value and the ninth cyclic displacement value is an odd number between 0 and 12;

28. The method according to claim 27, wherein the method further includes:

The base station selects a sixth cyclic displacement value and a seventh cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 7 and 8 in the extended cyclic prefix subframe; the sixth cyclic displacement value The absolute value of the difference from the seventh cyclic displacement value is an odd number between 0 and 12.

29. The method according to claim 27 or 28, wherein the method further includes:

30. A base station, the base station includes:

The selection unit selects the cyclic displacement values of {2, 3}, {3, 2}, and {3, 4} for the enhanced resource particle group sequence numbers in OFDM symbols with sequence numbers 5 and 6 in the conventional cyclic prefix subframe, respectively. Or {4, 3}; Or, for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 12 and 13 in the regular cyclic prefix subframe, select the cyclic displacement values to be {2, 3} and {3, respectively. 2}, {3, 4} or {4, 3}; or, for the enhanced resource particle group sequence numbers in the OFDM symbols with sequence numbers 9 and 10 in the conventional cyclic prefix subframe, select the first cyclic displacement value respectively and a second cyclic displacement value; the absolute value of the difference between the first cyclic displacement value and the second cyclic displacement value is an odd number between 0 and 12; or, for the sequence number in the regular cyclic prefix subframe is 8 , the enhanced resource particle group sequence number within the OFDM symbol of 10, select the third cyclic displacement value and the second cyclic displacement respectively. value; the absolute value of the difference between the third cyclic displacement value and the second cyclic displacement value is an odd number between 0 and 12; the mapping unit, within each physical resource block pair, sequentially numbered enhanced resources The particle group sequence number is mapped to resource particles other than the demodulation reference signal, and the enhanced resource particle group sequence number within the conventional cyclic prefix subframe OFDM symbol is cyclically shifted according to the cyclic shift value.

31. A base station, the base station includes:

The selection unit selects the fourth cyclic displacement value and the fifth cyclic displacement value respectively for the enhanced resource particle group sequence numbers in the OFDM symbols with serial numbers 4 and 5 in the extended cyclic prefix subframe; the fourth cyclic displacement value and the The absolute value of the difference between the fifth cyclic displacement values is an odd number between 0 and 12; or, for the enhanced resource element group sequence numbers in the OFDM symbols with sequence numbers 7 and 8 in the extended cyclic prefix subframe, select respectively The sixth cyclic displacement value and the seventh cyclic displacement value; the absolute value of the difference between the sixth cyclic displacement value and the seventh cyclic displacement value is an odd number between 0 and 12; or, for the extended cyclic prefix sub The enhanced resource particle group sequence numbers in the OFDM symbols with serial numbers 10 and 11 in the frame select the eighth cyclic displacement value and the ninth cyclic displacement value respectively; the difference between the eighth cyclic displacement value and the ninth cyclic displacement value The absolute value of is an odd number between 0 and 12.

A mapping unit, within each physical resource block pair, maps the sequentially numbered enhanced resource element group sequence number to resource elements other than the demodulation reference signal, and maps the extended cyclic prefix subframe OFDM according to the cyclic displacement value. The sequence number of the enhanced resource particle group within the symbol is cyclically displaced.

32. A communication system, the communication system comprising the base station according to claim 30 or 31.

33. A computer-readable program, wherein when the program is executed in a base station, the program causes the computer to execute the resource mapping method according to any one of claims 1 to 29 in the base station.

34. A storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the resource mapping method according to any one of claims 1 to 29 in a base station.