CN104104636B - The method for configuring physical resource for the PBCH demodulated based on DM RS - Google Patents
The method for configuring physical resource for the PBCH demodulated based on DM RS Download PDFInfo
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Abstract
The invention provides a kind of method for configuring physical resource in the communication environment based on independent new wave-carring type for the PBCH demodulated based on DM RS, and a kind of method for carrying out the demodulation based on DM RS to PBCH and public search space.According to the preferred embodiment of the invention, PBCH at least includes public search space configuration information, it is used for the interval that assisting user equipment determines the Physical Resource Block pair that the public search space of the independent new wave-carring type cell where user equipment is used, and in Physical Resource Block to upper, resource element distribution used in PBCH is distributed in the OFDM symbol residing for DM RS and in the OFDM symbol adjacent with the OFDM symbol residing for the DM RS in the OFDM symbol residing for DM RS, or by resource element used in PBCH.Realized by the present invention and provide the scheme demodulated based on DM RS for independent new wave-carring type, and for user equipment, when being initially accessed, the acquisition of public search space provides support.
Description
Technical Field
The invention relates to a mobile communication technology, in particular to a method for configuring physical resources for a Physical Broadcast Channel (PBCH) based on demodulation of a physical downlink shared channel (DM-RS) in a communication environment based on an independent new carrier type, and a method for demodulating the PBCH and a public search space based on the DM-RS.
Background
In LTE-Advanced Release11 and future Release12, a New Carrier Type (NCT) is introduced to improve spectrum efficiency, heterogeneous network support, and power saving without limiting backward compatibility. For new carrier types of new design, this means that some legacy channels (e.g., common reference signal CRS, physical broadcast channel PBCH, synchronization channel, etc.) can be removed or partially removed to achieve more efficient frequency efficiency. Currently, there are two issues with this proposal in RAN1, one is a non-independent new carrier type (non-standby NCT) that has overlapping coverage with the legacy carriers, and the other is an independent new carrier type (standby NCT).
For the latter, a separate new carrier type can be used for the primary carrier and support initial access for that carrier. Depending on the definition of the separate new carrier and the current conferencing strategy of RAN1, the CRS will no longer have demodulation functionality for the separate new carrier type. Furthermore, network assistance from the macro cell for initial access is also not available for the new carrier type on its own.
Therefore, some common channels on the physical layer need to be redesigned from consideration. Since, as mentioned above, if CRS no longer has demodulation function (or CRS becomes sparse, even if there is one, it can no longer be used for demodulation), and there is no cross-cell/carrier assistance from legacy carriers, in this case, the original common channels based on CRS demodulation, such as PBCH and common search space (common search space), need to be adjusted accordingly.
Disclosure of Invention
Based on the above considerations, the present invention provides a method for performing DM-RS based demodulation on PBCH and common search space for an independent new carrier type, and accordingly provides a method for configuring physical resources for the DM-RS demodulation-based PBCH in a communication environment based on the independent new carrier type.
According to a first aspect of the present invention, a method for configuring physical resources for a PBCH based on DM-RS demodulation in a communication environment based on an independent new carrier type is provided, where the PBCH includes at least common search space configuration information, and the common search space configuration information is used to assist a user equipment in determining an interval of a physical resource block pair used by a common search space of an independent new carrier type cell where the user equipment is located, and the method includes: and allocating Resource elements (Resource elements) used by the PBCH on OFDM symbols where DM-RS is located or allocating the Resource elements used by the PBCH on OFDM symbols where DM-RS is located and OFDM symbols adjacent to the OFDM symbols where DM-RS is located on physical Resource block pairs.
Here, the demodulation of the PBCH is performed based on the DM-RS. The demodulation performance of the DM-RS is improved by positioning the resource elements used by the PBCH adjacent to the resource elements occupied by the DM-RS. In addition, in order for the user equipment to support initial access for an independent new carrier type, common search space configuration information will be included in PBCH.
Preferably, on the physical resource block pair, the resource elements corresponding to the OFDM symbol 12 and the subcarriers 1, 6, 11 and the resource elements corresponding to the OFDM symbol 13 and the subcarriers 1, 6, 11 are allocated to the DM-RS, and all the resource elements on the OFDM symbol 11 and the remaining resource elements on the OFDM symbols 12, 13 are allocated to the PBCH.
Here, the position of the original PSS/SSS (primary/secondary synchronization signal) in the physical resource block pair is not changed, and the position of the new resource element is allocated in the physical resource block pair for PBCH.
Preferably, on the physical resource block pair, all resource elements on OFDM symbol 1 are allocated for SSS, all resource elements on OFDM symbol 2 are allocated for PSS, resource elements corresponding to OFDM symbol 5 and subcarriers 1, 6, 11, resource elements corresponding to OFDM symbol 6 and subcarriers 1, 6, 11, resource elements corresponding to OFDM symbol 12 and subcarriers 1, 6, 11, and resource elements corresponding to OFDM symbol 13 and subcarriers 1, 6, 11 are allocated to DM-RS, and remaining resource elements on OFDM symbols 5, 6, 12, 13 are allocated to PBCH.
Here, the position of the PSS/SSS in the physical resource block pair is changed and the position of a new resource element is allocated in the physical resource block pair for the PBCH.
According to a second aspect of the present invention, there is provided a method for DM-RS based demodulation of PBCH and common search space in a user equipment, the method comprising: B. judging whether the cell type is an independent new carrier type cell; C. when the cell type is the independent new carrier type cell, receiving a DM-RS sequence from a base station, wherein the DM-RS sequence is formed by precoding by the base station through a Rank-1 precoding mode by taking precoding with a codebook index number O in a codebook as a reference, and is transmitted by the base station through antenna ports 7 and 8; and D, based on a preset Rank-1 precoding mode, performing channel estimation on the DM-RS sequence to demodulate PBCH, wherein the PBCH at least comprises public search space configuration information, and the public search space configuration information is used for assisting the user equipment to determine the interval of a physical resource block pair used by a public search space of an independent new carrier type cell where the user equipment is located.
Preferably, for the independent new carrier type cell, on a physical resource block pair, all resource elements on OFDM symbol 1 are allocated for SSS, and all resource elements on OFDM symbol 2 are allocated for PSS, and the step B further includes: determining whether a cell type is the independent new carrier type cell by determining locations of resource elements occupied by the SSS and the PSS on the physical resource block pair.
Preferably, a specific physical cell identity (physical cell identity) is allocated to the independent new carrier type cell, and the step B further includes: and judging whether the cell type is the independent new carrier type cell or not by identifying whether the physical cell identifier of the cell is a specific physical cell identifier or not.
Preferably, the method further comprises step E: E. determining a common search space based on the common search space configuration information in the PBCH and demodulating the common search space based on the DM-RS sequence.
Preferably, the situation that different physical resource block pairs are respectively used in the common search space of each independent new carrier type cellIn this case, the step E further includes: E1. determining an interval X of a physical resource block pair used by a common search space of an independent new carrier type cell where the user equipment is located according to the common search space configuration information in the PBCH; E2. determining the number of downlink physical resource block pairs according to the channel bandwidthE3. Determining the number of physical resource block pairs used by the common search space of the independent new carrier type cell where the user equipment is positioned asE4., determining the sequence number of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the following formula to determine the common search space:wherein,serial number of physical resource block pair used in common search space of independent new carrier type Cell, CellIDSpecific physical cell identity, M, indicating an independent new carrier type cellShiftRepresentation for CellIDA predetermined sparsity of displacement of; and E5. demodulating the determined common search space based on the DM-RS sequence.
Here, coordination of inter-cell interference is achieved by shifting the physical resource blocks to the layer to ensure robustness of acquisition of the common search space.
Preferably, in the case that the common search space of each independent new carrier type cell uses the same physical resource block pair, the step E further comprises: x1., determining the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the common search space configuration information in the PBCHAn interval X; x2. determining the number of downlink physical resource block pairs according to the channel bandwidthX3. determining the number of physical resource block pairs used by the common search space of the independent new carrier type cell where the user equipment is located asX4. determining the total number of available ECCEs configured for the user equipment in the k-th sub-frame according to the number of ECCEs t allocated to one physical resource block pairDetermining a common search space of an independent new carrier type cell where the user equipment is located; and X6, demodulating the determined common search space based on the DM-RS sequence.
Here, coordination of inter-cell interference is achieved by shifting of the search space level to ensure robustness of acquisition of the common search space.
Preferably, in the step X5, the common search space of the independent new carrier type cell in which the user equipment is located is determined by the following formula:
wherein L represents an aggregation level; n isCIFor carrier indication, M is used for indicating each carrier in carriers which can be scheduled simultaneously（L)A total number of ECCE candidates representing a search space of the L-th aggregation level; number M ═ 0., M(L)-1, represents M(L)Number in each ECCE candidate; y iskRepresenting a hash function based on frame k and user equipment RNTI; cellIDA specific physical cell identity representing an independent new carrier type cell; mShiftRepresentation for CellIDPredetermined sparse range of shiftDegree; l-1, indicating the number of ECCEs for each aggregation level.
Preferably, the common search space configuration information includes a common search space configuration index, a predetermined relationship is stored in the user equipment, and the predetermined relationship indicates a correspondence relationship between the common search space configuration index and an interval of a physical resource block pair used by a common search space of an independent new carrier type cell where the user equipment is located, where the step E1 and/or the step X1 further includes: and determining the interval X of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the common search space configuration index number and the preset relation.
Preferably, in the step X4, the number t of ECCEs allocated to one physical resource block pair is 2 or 4.
Preferably, the method further comprises, before step B, step a: A. synchronizing with the base station.
Preferably, the method further comprises, after step F, the steps of: F. establishing RRC connection with a base station; determining and blindly detecting a user equipment specific search space of the EPDCCH of the user equipment.
According to a third aspect of the present invention, a method for assisting a user equipment in demodulation of PBCH and common search space based on DM-RS in a base station of an independent new carrier type cell is proposed, the method comprising: a. forming a DM-RS sequence by a Rank-1 precoding mode by taking precoding with a codebook index number of 0 in a codebook as a reference; transmitting the DM-RS sequence to the user equipment through antenna ports 7 and 8 so that the user equipment can demodulate the PBCH and the common search space based on DM-RS.
The invention provides a physical resource allocation method of PBCH aiming at an independent new carrier type, and further provides a method for demodulating PBCH and a public search space based on DM-RS under the independent new carrier type. Therefore, the DM-RS demodulation-based scheme is provided for the independent new carrier type, and the acquisition of the common search space at the initial access of the user equipment is supported.
Various aspects of the invention will become apparent from the following description of specific embodiments.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 illustrates an allocation of physical resources for PBCH on a physical resource block pair in a communication environment based on an independent new carrier type according to an embodiment of the present invention;
figure 2 illustrates an allocation of resource elements for PBCH on a physical resource block pair in a communication environment based on an independent new carrier type according to another embodiment of the present invention;
fig. 3 shows a flowchart of a method for assisting a user equipment in DM-RS based demodulation of PBCH and common search space at a base station side according to yet another embodiment of the present invention; and
fig. 4 illustrates a flowchart of a method for DM-RS based demodulation of PBCH and common search space at a user equipment side according to still another embodiment of the present invention.
In the drawings, like or similar reference characters designate like or corresponding parts or features throughout the different views.
Detailed Description
Fig. 1 illustrates an allocation of physical resources for PBCH on a physical resource block pair in a communication environment based on an independent new carrier type according to an embodiment of the present invention. Fig. 2 illustrates an allocation of resource elements for PBCH on a physical resource block pair in a communication environment based on an independent new carrier type according to another embodiment of the present invention.
Here, PBCH transmission will still use the central 6 physical resource block pairs. Two configurations of resource elements of a new PBCH using different OFDM symbols in a subframe are proposed in fig. 1 and 2. The PBCH period is still the same as the conventional PBCH period and is mapped to the first subframe of each radio frame, repeating every 40 ms. In addition, as in the conventional PBCH, in the frequency domain, the central 72 subcarriers (6 physical resource block pairs) are also used for PBCH transmission.
The location of the resource elements of the PBCH on the OFDM symbol in the relevant physical resource block pair will be changed to fit the DM-RS based demodulation approach, taking into account that CRS based demodulation is no longer present.
The following rules are followed for the allocation of physical resources of PBCH:
1. the central 6 physical resource block pairs are still used for PBCH transmission;
2. and allocating the resource elements used by the PBCH on the OFDM symbols where the DM-RS is located or allocating the resource elements used by the PBCH on the OFDM symbols where the DM-RS is located and the OFDM symbols adjacent to the OFDM symbols where the DM-RS is located, so that the demodulation of the PBCH based on the DM-RS is more reliable. Allocating a new OFDM symbol for PBCH;
3. remove PHICH configuration information (3 bits) in PBCH (detailed below);
4. common search space configuration information (described in detail below) is added to the PBCH.
In particular, referring to fig. 1, it is directed to the DM-RS puncturing situation. As shown in fig. 1, the SSS and PSS still occupy the resources on the 5 th and 6 th symbols on the physical resource block pair (light right-hatched resource elements and light left-hatched resource elements, respectively). And the resource elements corresponding to the OFDM symbol 12 and the subcarriers 1, 6, 11 and the resource elements corresponding to the OFDM symbol 13 and the subcarriers 1, 6, 11 are allocated to DM-RS (i.e., the resource elements with dark right-dashed lines), and all the resource elements on the OFDM symbol 11 and the remaining resource elements on the OFDM symbols 12, 13 are allocated to the PBCH (i.e., the resource elements with cross-hatched lines).
Here, the actually used resource elements of PBCH on the corresponding physical resource block pair are 30, which is 10 resource elements less than the conventional PBCH. For a legacy PBCH, it would carry, for example, the following information: downlink system bandwidth, PHICH structure, and the highest 8 bits of system frame number. Since, for the separate new carrier type, the functionality of the PHICH structure is no longer needed, since there is no PHICH based CRS demodulation in the separate new carrier type. On the other hand, in consideration of support for initial access of the user equipment to an independent new carrier type, common search space configuration information will be included in the PBCH (the common search space configuration information will be described in detail below). Therefore, in summary, in the PBCH according to the present invention, the original PHICH configuration information (3 bits) is not included, and the common search space configuration information is added.
Therefore, as described above, although new common search space configuration information is to be added in the PBCH, the original PHICH configuration information (3 bits) is removed, and since 10 bits of idle are additionally redundant in the conventional PBCH, 30 resource elements for the PBCH shown in fig. 1 are sufficient for the new common search space configuration information.
Reference is now made to fig. 2 for the case of PSS/SSS reallocation of resources. As shown in fig. 2, on the physical resource block pair, all resource elements (light-colored right-hatched resource elements) on the OFDM symbol 1 are allocated for the SSS, all resource elements (light-colored left-hatched resource elements) on the OFDM symbol 2 are allocated for the PSS, resource elements corresponding to the OFDM symbol 5 and the subcarriers 1, 6, 11, resource elements corresponding to the OFDM symbol 6 and the subcarriers 1, 6, 11, resource elements corresponding to the OFDM symbol 12 and the subcarriers 1, 6, 11, and resource elements corresponding to the OFDM symbol 13 and the subcarriers 1, 6, 11 are allocated to the DM-RS (dark-colored right-hatched resource elements), and remaining resource elements on the OFDM symbols 5, 6, 12, 13 are allocated to the PBCH (cross-hatched resource elements). Here, compared to the embodiment of fig. 1, the actually used resource element of PBCH on the corresponding physical resource block pair is 36.
On the other hand, compared to the prior art, in order to support DM-RS based demodulation of PBCH and common search space during the initial access period (i.e. without receiving RRC signaling), some new definitions of the operation procedure between the base station and the user equipment are required.
Fig. 3 shows a flowchart of a method for assisting a user equipment in DM-RS based demodulation of PBCH and common search space at a base station side according to yet another embodiment of the present invention.
As shown in fig. 3, in the first step, the base station forms a DM-RS sequence by a Rank-1 precoding manner with reference to precoding with a codebook index number of 0 in a codebook. That is, the DM-RS is precoded here in the form of a so-called "unit matrix" to form a DM-RS sequence.
In a second step, the base station antenna ports 7, 8 transmit DM-RS sequences to the user equipment for demodulation by the user equipment on the PBCH and common search space based on DM-RS. Here, transmitting the DM-RS sequence through the antenna ports 7, 8 may map resource elements occupied by the DM-RS at positions shown in fig. 1 or fig. 2, thereby making demodulation based on the DM-RS more accurate.
Fig. 4 illustrates a flowchart of a method for DM-RS based demodulation of PBCH and common search space at a user equipment side according to still another embodiment of the present invention.
In step S1, the user equipment synchronizes with the base station. Then, in step S2, the user equipment determines whether the cell type is an independent new carrier type cell. If not a separate new carrier type cell but a legacy carrier type cell, the operation is performed according to a legacy procedure, which is not described in detail herein. And when the cell type is an independent new carrier type cell, the method proceeds to step S3.
Preferably, in step S2, the determination may be made, for example, by the following two ways.
In a first embodiment, SSS is allocated all resource elements on OFDM symbol 1 and PSS is allocated all resource elements on OFDM symbol 2 for an independent new carrier type cell on a physical resource block pair (i.e. the situation shown in fig. 2). In this case, it is determined whether the cell type is an independent new carrier type cell by determining the location of resource elements occupied by the SSS and PSS on the physical resource block pair in step S2. Specifically, if the SSS uses all resource elements on OFDM symbol 1 instead of all resource elements on OFDM symbol 5 (i.e. the allocation of resource elements for SSS in the legacy case), and the PSS uses all resource elements on OFDM symbol 2 instead of all resource elements on OFDM symbol 6 (i.e. the allocation of resource elements for SSS in the legacy case), then the cell may be determined to be an independent new carrier type cell.
In a second embodiment, the individual new carrier type cells are assigned with specific physical cell identities, i.e. some specific physical cell identities are reserved for the individual new carrier type cells. In this case, the user equipment may determine whether the cell type is an independent new carrier type cell by recognizing whether the physical cell identity of the cell is a specific physical cell identity in step S2.
In case that the cell type is an independent new carrier type cell and thus the method proceeds to step S3, the user equipment receives a DM-RS sequence from the base station in step S3. As described above, the DM-RS sequence is precoded by the base station in a Rank-1 precoding manner based on precoding with codebook index number 0 in the codebook. And the DM-RS sequence is transmitted by the base station through antenna ports 7 and 8, so the resource element positions occupied by the DM-RS will be as shown in fig. 1 or fig. 2.
In addition, in step S3, the user equipment performs channel estimation with the DM-RS sequence based on a predetermined Rank-1 precoding scheme to demodulate the PBCH. Here, the ue shall perform a default operation, that is, perform a predetermined Rank-1 precoding manner by default, so as to obtain a Rank value, and perform channel estimation based on the Rank value. In the prior art, the value of rank is notified to the ue by the base station through DCI in the USS stage. In contrast, since the USS procedure has not yet been started in the present invention, the user equipment will implement the precoding scheme of rank-1 by default, and thus determine the value of rank (i.e., rank 1 here). In addition, at least common search space configuration information (to be described in detail below) is included in the PBCH.
Then, the method proceeds to step S4, where the user equipment determines a common search space based on the common search space configuration information in the PBCH and demodulates the common search space based on the DM-RS sequence.
Specifically, in the present invention, the following design principles of the common search space will be followed: 1. the original function of the public search space is still kept in the design of the new public search space; 2. common search space configuration information will be included in the PBCH (mentioned above); 3. the ECCE definition and the structure of physical resource block pairs in the design of USS in EPDCCH are maintained: a. each physical resource block pair has 2 or 4 ECCEs; b. higher aggregation levels, e.g., 4 and 8, are used. 4. In view of the coordination of inter-cell interference, especially for dense cell distribution, the robustness of common search space acquisition needs to be maintained. Therefore, two resource allocation modes are defined for the common search space, namely the shift of the physical resource block to the layer or the shift of the search space layer.
First, a method of shifting the physical resource block level will be described in detail. In this implementation scenario, the common search space of each individual new carrier type cell uses mutually orthogonal pairs of physical resource blocks and is shifted based on the physical cell identity. Specifically, the OAM would assign different physical cell identities for adjacent independent new carrier type cells. For each cell, the common search space of the cell will use several spare physical resource block pairs without colliding with the physical resource block pairs used by the common search spaces of other cells.
Firstly, the user equipment determines the interval X of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the common search space configuration information in the PBCH.
Table 1 shows a predetermined relationship indicating a correspondence of the common search space configuration index number and an interval of a physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located. The table may be pre-stored on both sides of the user equipment and the base station, for example. In an embodiment of the present invention, the common search space configuration information in the PBCH includes a common search space configuration index number, and the ue determines, according to the index number and through a predetermined relationship (i.e. table 1), the interval X of the physical resource block pair used by the common search space of the independent new carrier type cell where the ue is located.
| Common search space configuration index number | Spacer |
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 10 |
| 6 | 12 |
| 7 | 15 |
| 8 | 20 |
| 9 | 25 |
TABLE 1
For example, if the index number of the common search space configuration in the common search space configuration information is 2, the ue may determine, according to the pre-stored predetermined relationship, that the interval of the physical resource block pair used by the common search space of the independent new carrier type cell where the ue is located is 4. This means that there is a common search space for the new carrier type cell for every four physical resource block pairs.
Here, it is to be noted that the common search space configuration information according to the present invention is intended for assisting the user equipment to determine the spacing of the physical resource block pairs used by the common search space of the independent new carrier type cell in which the user equipment is located. In this way, the common search space for each individual new carrier type cell will use mutually orthogonal pairs of physical resource blocks. Also, the above-described common search space configuration index number is only one exemplary embodiment.
Thereafter, the user equipment determines the number of downlink physical resource block pairs according to the channel bandwidthThis can be implemented, for example, by table 2 (see 3GPP TS 36.101):
TABLE 2
For example, when the channel bandwidth is 10MHz, the number of downlink physical resource block pairsIs 50.
Then, the user equipment determines the number of physical resource block pairs used by the common search space of the independent new carrier type cell where the user equipment is located asIn this embodiment, it will be derived that the number of physical resource block pairs is 12.
The user equipment will then use the CellID(i.e., the specific physical cell identity of the individual new carrier type cell) to shift the physical resource block pairs used by the common search space of the new carrier type cell. Specifically, for example, the sequence number of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located may be determined by equation 1 to determine the common search space:
(formula 1)
Wherein,indicating independence of the user equipmentNumber of physical resource block pair used in common search space of new carrier type Cell, CellIDSpecific physical cell identity, M, indicating an independent new carrier type cellShiftRepresentation for CellIDIs determined by the predetermined sparseness of the shift.
Therefore, the user equipment determines the sequence number of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located, namely, the position of the physical resource block pair mapped with the common search space is located, and therefore the common search space is determined. The user equipment will then demodulate the determined common search space based on the DM-RS sequence.
Further, it is noted that equation 1 is intended to combine the spacing with the shift of the specific physical cell identity of the new carrier type cell. In this way, the common search spaces of different new carrier type cells will be orthogonal to each other, thus eliminating the need to set 4 ECCE candidate settings for aggregation level 4 and 2 ECCE candidates for aggregation level 8. Since 2 ECCE candidate settings are set for aggregation level 4, 1 ECCE candidate setting for aggregation level 8 is already sufficient to achieve differentiation.
In addition, the spacing X of the physical resource block pairs used by the common search space of the individual new carrier type cells in table 1 may also take different values for different bandwidths and possibly future implementations. Accordingly, the numerical values set forth in Table 1 are for illustrative purposes only. The index numbers in table 1 may also represent different intervals X for different bandwidths. For example, for 1.4MHz, index number 0 corresponds to an interval value of 1 and index number 1 corresponds to an interval value of 2, whereas for 5MHz, index number 0 corresponds to an interval value of 8 and index number 1 corresponds to an interval value of 10.
Next, the manner of shifting of the search space level of the common search space for different cells will be described in detail. In this implementation, the same physical resource block pair is used in the common search space of each individual new carrier type cell.
First, similar to the first embodiment, the ue determines, according to the common search space configuration information in the PBCH, the interval X of the physical resource block pair used by the common search space of the independent new carrier type cell where the ue is located. This can also be implemented, for example, by the index numbers in table 1. The specific embodiment is similar to that described in the first embodiment and will not be described in detail here.
Thereafter, still similar to the first embodiment, the user equipment determines the number of downlink physical resource block pairs according to the channel bandwidthThis can also be implemented, for example, by table 2.
Then, the user equipment determines the number of physical resource block pairs used by the common search space of the independent new carrier type cell where the user equipment is located asThus, the user equipment determines the respective physical resource block pairs for the common search space that are commonly used by the respective independent new carrier type cells.
Then, the user equipment determines the total number of available ECCEs configured for all user equipment in the kth subframe according to the number t of ECCEs allocated to one physical resource block pair by equation 2
(formula 2)
Preferably, the number t of ECCEs allocated to one physical resource block pair is 2 or 4.
Then, a randomization technique at the search level can be applied for ECCE, taking into account the inter-cell interference. This can be achieved, for example, by equation 3:
(formula 3)
Wherein L represents an aggregation level; n isCIFor carrier indication, M is used for indicating each carrier in carriers which can be scheduled simultaneously(L)A total number of ECCE candidates representing a search space of the L-th aggregation level; number M ═ 0., M(L)-1, represents M(L)Number in each ECCE candidate; y iskRepresenting a hash function based on frame k and user equipment RNTI; cellIDA specific physical cell identity representing an independent new carrier type cell; mShiftIs shown for use in CEllIDA predetermined sparsity of displacement of; l-1, indicating the number of ECCEs for each aggregation level.
By equation 3, the ECCEs corresponding to the common search spaces of the new carrier type cell can be shifted by the physical cell identifier, thereby distinguishing the ECCEs used by the common search spaces of the different cells. Therefore, the ue determines the common search space of the independent new carrier type cell where the ue is located, i.e. the ECCE usable by the common search space of the independent new carrier type cell. The user equipment will then demodulate the determined common search space based on the DM-RS sequence.
In summary, in step S4, the present invention provides two resource allocation methods for the common search space with respect to the inter-cell interference. After determining the common search space of the cell, the user equipment demodulates the common search space based on the DM-RS.
The method then proceeds to step S5, where the ue establishes an RRC connection with the base station. Then, the method proceeds to step S6, and the user equipment determines the user equipment specific search space of the EPDCCH and performs blind detection on it.
Furthermore, it is noted that even after RRC connection establishment, for those physical resource block pairs mapped by PBCH and/or common search space, the user equipment will still process it in the above-described manner. For other data transmission, the ue may choose to use other DM-RS configurations and codebook configurations (e.g., codes with codebook indices other than 0).
It should be noted that the above-mentioned embodiments are only exemplary, and do not limit the present invention. Any solution that does not depart from the spirit of the invention is intended to be covered by the scope of the invention, which includes the use of different features that appear in different embodiments, and the methods may be combined to advantage.
Claims (13)
1. A method of configuring physical resources for a PBCH based on DM-RS demodulation in an independent new carrier type based communication environment, wherein the PBCH includes at least common search space configuration information for assisting a user equipment in determining an interval of physical resource block pairs used by a common search space of an independent new carrier type cell in which the user equipment is located, the method comprising:
on the physical resource block pair, allocating resource elements corresponding to OFDM symbol 12 and subcarriers 1, 6, and 11 and resource elements corresponding to OFDM symbol 13 and subcarriers 1, 6, and 11 to DM-RS, and allocating all resource elements on OFDM symbol 11 and the remaining resource elements on OFDM symbols 12 and 13 to PBCH; or on the physical resource block pair, allocating all resource elements on OFDM symbol 1 for SSS, allocating all resource elements on OFDM symbol 2 for PSS, allocating resource elements corresponding to OFDM symbol 5 and subcarriers 1, 6, 11, resource elements corresponding to OFDM symbol 6 and subcarriers 1, 6, 11, resource elements corresponding to OFDM symbol 12 and subcarriers 1, 6, 11, and resource elements corresponding to OFDM symbol 13 and subcarriers 1, 6, 11 to DM-RS, and allocating the remaining resource elements on OFDM symbols 5, 6, 12, 13 to PBCH.
2. A method of DM-RS based demodulation of PBCH and common search space in a user equipment, the method comprising:
B. judging whether the cell type is an independent new carrier type cell;
C. when the cell type is the independent new carrier type cell, receiving a DM-RS sequence from a base station, wherein the DM-RS sequence is formed by precoding by the base station through a Rank-1 precoding mode by taking precoding with a codebook index number of 0 as a reference in a codebook as well as is transmitted by the base station through antenna ports 7 and 8, and the DM-RS sequence is configured on resource elements corresponding to an OFDM symbol 12 and subcarriers 1, 6 and 11 and resource elements corresponding to the OFDM symbol 13 and the subcarriers 1, 6 and 11 on a physical resource block pair or is configured on resource elements corresponding to an OFDM symbol 5 and the subcarriers 1, 6 and 11, resource elements corresponding to the OFDM symbol 6 and the subcarriers 1, 6 and 11, resource elements corresponding to the OFDM symbol 12 and the subcarriers 1, 6 and 11 and resource elements corresponding to the OFDM symbol 13 and the subcarriers 1, 6. 11, corresponding to the resource element; and
D. and performing channel estimation on the DM-RS sequence based on a preset Rank-1 precoding mode to demodulate PBCH (physical broadcast channel), wherein the PBCH at least comprises public search space configuration information, and the public search space configuration information is used for assisting the user equipment to determine the interval of a physical resource block pair used by a public search space of an independent new carrier type cell where the user equipment is located.
3. The method of claim 2, wherein for the standalone new carrier type cell, all resource elements on OFDM symbol 1 are allocated for SSS and all resource elements on OFDM symbol 2 are allocated for PSS on a physical resource block pair, and wherein step B further comprises:
determining whether a cell type is the independent new carrier type cell by determining locations of resource elements occupied by the SSS and the PSS on the physical resource block pair.
4. The method according to claim 2, wherein the independent new carrier type cell is allocated with a specific physical cell identity, and the step B further comprises:
and judging whether the cell type is the independent new carrier type cell or not by identifying whether the physical cell identifier of the cell is a specific physical cell identifier or not.
5. The method according to claim 2, characterized in that it further comprises a step E:
E. determining a common search space based on the common search space configuration information in the PBCH and demodulating the common search space based on the DM-RS sequence.
6. The method according to claim 5, wherein in case that the common search space of each independent new carrier type cell uses respectively different physical resource block pairs, the step E further comprises:
E1. determining an interval X of a physical resource block pair used by a common search space of an independent new carrier type cell where the user equipment is located according to the common search space configuration information in the PBCH;
E2. determining downlink physical resources according to channel bandwidthNumber of block pairs
E3. Determining the number of physical resource block pairs used by the common search space of the independent new carrier type cell where the user equipment is positioned asAnd
E4. determining the sequence number of a physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the following formula so as to determine the common search space:
wherein,serial number of physical resource block pair used in common search space of independent new carrier type Cell, CellIDSpecific physical cell identity, M, indicating an independent new carrier type cellShiftRepresentation for CellIDA predetermined sparsity of displacement of; and
E5. demodulating the determined common search space based on the DM-RS sequence.
7. The method according to claim 5, wherein in case that the common search space of each independent new carrier type cell uses the same physical resource block pair, said step E further comprises:
x1., determining the interval X of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the common search space configuration information in the PBCH;
x2. determining the number of downlink physical resource block pairs according to the channel bandwidth
X3. determining the number of physical resource block pairs used by the common search space of the independent new carrier type cell where the user equipment is located as
X4. the total number of available ECCEs configured for all user equipments in the k-th sub-frame is determined according to the number of ECCEs t allocated to one physical resource block pair by
Determining a common search space of an independent new carrier type cell where the user equipment is located; and
and X6, demodulating the determined common search space based on the DM-RS sequence.
8. The method according to claim 7, wherein in step X5, the common search space of the independent new carrier type cell where the ue is located is determined by:
wherein L represents an aggregation level; n isCIFor carrier indication, M is used for indicating each carrier in carriers which can be scheduled simultaneously(L)A total number of ECCE candidates representing a search space of the L-th aggregation level; number M is 0, …, M(L)-1, represents M(L)Number in each ECCE candidate; y iskRepresenting a hash function based on frame k and user equipment RNTI; cellIDA specific physical cell identity representing an independent new carrier type cell; mShiftRepresentation for CellIDA predetermined sparsity of displacement of; i-0, 1,2 … L-1, indicating the number of ECCEs for each aggregation level.
9. The method according to claim 6 or 7, wherein the common search space configuration information comprises a common search space configuration index number, and a predetermined relationship is stored in the user equipment, and the predetermined relationship indicates a correspondence relationship between the common search space configuration index number and an interval of a physical resource block pair used by a common search space of an independent new carrier type cell where the user equipment is located, and the step E1 and/or the step X1 further comprises:
and determining the interval X of the physical resource block pair used by the common search space of the independent new carrier type cell where the user equipment is located according to the common search space configuration index number and the preset relation.
10. The method according to claim 7, wherein in the step X4, the number t of ECCEs allocated to one physical resource block pair is 2 or 4.
11. The method of claim 2, further comprising, before step B, step a:
A. synchronizing with the base station.
12. The method of claim 5, further comprising, after step E, the steps of:
F. establishing RRC connection with a base station; and
G. determining and blindly detecting a user equipment-specific search space for the EPDCCH of the user equipment.
13. A method of assisting user equipment in DM-RS based demodulation of PBCH and common search space in a base station of an independent new carrier type cell, the method comprising:
a. forming a DM-RS sequence by a Rank-1 precoding mode by taking precoding with a codebook index number of 0 in a codebook as a reference; and
b. and transmitting the DM-RS sequence to the user equipment through antenna ports 7 and 8, so that the user equipment performs DM-RS-based demodulation on the PBCH and the common search space, where the DM-RS sequence is configured on resource elements corresponding to OFDM symbols 12 and subcarriers 1, 6, and 11 and resource elements corresponding to OFDM symbols 13 and subcarriers 1, 6, and 11 on a physical resource block pair, or is configured on resource elements corresponding to OFDM symbols 5 and subcarriers 1, 6, and 11, resource elements corresponding to OFDM symbols 6 and subcarriers 1, 6, and 11, resource elements corresponding to OFDM symbols 12 and subcarriers 1, 6, and 11, and resource elements corresponding to OFDM symbols 13 and subcarriers 1, 6, and 11 on a physical resource block pair.
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| CN106788931B (en) | 2016-09-30 | 2019-01-04 | 展讯通信（上海）有限公司 | The method and base station, user equipment that information is transmitted in communication system |
| CN108076517B (en) * | 2016-11-16 | 2021-11-19 | ***通信有限公司研究院 | Resource indication sending method, resource indication receiving method, network equipment and user equipment |
| CA3052428C (en) | 2017-02-03 | 2022-04-26 | Idac Holdings, Inc. | Broadcast channel transmission and demodulation |
| CN112039813B (en) | 2017-02-06 | 2023-05-30 | Lg 电子株式会社 | User equipment and method of user equipment operating in a wireless communication system |
| US10673552B2 (en) | 2017-04-14 | 2020-06-02 | Qualcomm Incorporated | Synchronization signal block designs for wireless communication |
| CN108809561B (en) | 2017-04-28 | 2020-11-03 | 维沃移动通信有限公司 | Transmission method of synchronization signal block, network equipment and user equipment |
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