CN102291208A - Method for transmitting uplink reference signal - Google Patents
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Abstract
The invention provides a method for transmitting an uplink reference signal. The method comprises the following steps of: determining the number of layers of current uplink MIMO (Multiple Input Multiple Output) data transmission; when the number of layers is smaller or equal to a preset NL (Number of Layer) threshold value, setting reference signal sequences of two uplink reference signal symbols inside a subframe according to the specific basic SGH (Sequence Group Hop)/basic SH (Sequence Hop) information of a cell and SGH/SH configuration information specially used for an LTE-A (Long Term Evolution-Advanced) user; and when the number of layers is larger than NL, setting the reference signal sequences of the two uplink reference signal symbols inside the subframe according to the specific SGH/SH information of the cell. According to the method provided by the invention, an SGH/SH technology can be used as far as possible while the orthogonality of the uplink reference signal is enhanced, and therefore better neighbor cell disturbance randomization effect is ensured.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method for transmitting an uplink Reference Signal (RS).
Background
In a Long Term Evolution (LTE) system, a physical layer transmission technique of an uplink is based on Single Carrier Frequency Division Multiplexing (SCFDMA), and an SCFDMA symbol of uplink data and an SCFDMA symbol of an uplink reference signal are Time Division Multiplexed (TDM). Specifically, each subframe is equally divided into two slots, and one SCFDMA symbol in each slot is used for transmitting the uplink reference signal. In generating the uplink reference signal sequence, the LTE system uses a base sequence with a constant envelope and good autocorrelation characteristics, and a plurality of reference signal sequences with good orthogonality can be generated from the base sequence by setting different Cyclic Shifts (CSs). In the LTE system, a maximum of 12 CSs can be set for one base sequence, and the CS actually allocated for use by the user is calculated by formula
To be determined. Wherein,
configuring through a high layer;set by a CS field in a Downlink Control Information (DCI) format, the CS field including 3 bits, which is associated with
The corresponding relationship of (A) is shown in Table 1; n isPRS(ns) Is a cell-specific time-slot hopped sequence.
Table 1: CS Domain in DCI Format and
corresponding relationship of
Multiple Input Multiple Output (MIMO) based data transmission is one method to enhance uplink performance. In LTE, single-user MIMO (SU-MIMO) operation is not supported, but multi-user MIMO (MU-MIMO) operation is supported. In LTE, orthogonality between user reference signals is guaranteed only when bandwidths allocated by multiple users are completely overlapped (i.e., base sequences are the same) and different RS sequences are generated with different CSs based on the same base sequence. In a long term evolution-enhanced (LTE-A) system, MU-MIMO and SU-MIMO are supported. For MU-MIMO, simulation proves that the MU-MIMO supporting unequal bandwidths can obviously improve the throughput of a system, but when bandwidths allocated by a plurality of users are not completely overlapped, the method for generating a plurality of reference signals based on CS of LTE cannot well ensure the orthogonality; for higher-order SU-MIMO, for example, the number of layers of MIMO transmission is 3 or 4, the same user uses multiple CSs to generate reference signals for each data stream, and the spacing between the CSs of the reference signals is small, which also results in poor orthogonality of the generated reference signals. Thus, a method is needed to improve the orthogonality between reference signals. In LTE-a, a technique of orthogonal spreading codes (OCC) is introduced, and specifically, the OCC technique is to spread two reference signal SCFDMA symbols within one subframe in time, and the spreading codes may be Walsh codes, i.e., [11] and [1-1 ]. Because the number of Walsh codes of length 2 is only two, the same Walsh code has to be reused when the number of users of MU-MIMO multiplexing is greater than 2; similarly, when the number of layers for SU-MIMO data transmission is greater than 2, then the reference signals for at least two data streams will use the same Walsh code. According to the current conclusion in LTE-a, the overhead of DCI format cannot be increased while the OCC technology is supported, so that in the DCI format, OCC is jointly encoded with CS to share 3-bit CS domain.
Another related technique is base Sequence Group Hopping (SGH) and base Sequence Hopping (SH), both of which are proposed to enhance the interference randomization effect between uplink signals of neighboring cells, which are configured through cell-specific higher layer signaling. In LTE, 30 basic sequence groups are defined, so that a basic sequence group hopping means that basic sequences belonging to different basic sequence groups are used variably every slot with one frame as a period. When the base sequence group hopping is turned off, the base sequence hopping can also be configured, which means that two base sequences belonging to the same base sequence group are used in two reference signals SCFDMA symbols in two slots of one subframe, respectively.
The SGH/SH technique has a certain influence on the effect of OCC technique. Specifically, assuming that the SGH/SH is turned on, when the bandwidths allocated by two users completely overlap, the orthogonality between the reference signals can be increased by using the OCC technique; however, when the bandwidths allocated by the two users do not completely overlap, orthogonality between reference signals cannot be enhanced even if the OCC technique is used, i.e., the OCC is ineffective in this case. In addition, assuming SGH/SH is off, the orthogonality between reference signals can always be increased using OCC. In this way, when the bandwidths of multiple users scheduled by the base station are completely overlapped, the OCC can be used to enhance the orthogonality of the reference signals regardless of whether the SGH/SH is turned on.
Therefore, in the existing LTE-a, the SGH/SH technology and the OCC technology cannot be considered well, and the better interference randomization effect of the neighboring cells cannot be ensured while the orthogonality of the uplink reference signal is enhanced.
Disclosure of Invention
The invention provides a method for transmitting an uplink reference signal, which can enhance the orthogonality of the uplink reference signal and ensure better adjacent cell interference randomization effect.
The technical scheme of the invention is realized as follows:
a method of transmitting uplink reference signals, comprising: determining the number of layers of current uplink MIMO data transmission;
when the number of layers is less than or equal to a preset number of layers threshold, setting reference signal sequences on two uplink reference signal symbols in a subframe according to cell specific SGH/SH information and special SGH/SH configuration information of an LTE-A user;
and when the layer number is greater than the preset layer number threshold value, setting reference signal sequences on two uplink reference signal symbols in the subframe according to the cell specific SGH/SH information.
Therefore, the method for transmitting the uplink reference signal provided by the invention compares the layer number of the uplink MIMO transmission of the user with the preset layer number threshold value when the uplink reference sequence is set, and determines whether the user executes the SGH/SH according to the comparison result, thereby enhancing the orthogonality of the uplink reference signal and simultaneously using the SGH/SH technology as much as possible, and ensuring better adjacent cell interference randomization effect.
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FIG. 1 is a flowchart illustrating a method for transmitting an uplink reference signal according to the present invention;
FIG. 2 is a diagram illustrating CS mapping PHICH in a continuous grouping manner;
fig. 3 is a diagram illustrating CS mapping PHICH when the first grouping method of the first embodiment is adopted.
Detailed Description
The invention provides a method for transmitting an uplink reference signal, which determines whether a user executes SGH/SH or not according to the number of layers of uplink MIMO transmission of the user when an uplink reference signal sequence is set, thereby enhancing the orthogonality of the uplink reference signal and simultaneously using the SGH/SH technology as much as possible to ensure better adjacent cell interference randomization effect.
It was previously mentioned that OCC can be used to enhance the orthogonality of reference signals when the bandwidths of multiple users scheduled by the base station are completely overlapping, regardless of whether SGH/SH is on or not. According to the situation, when the bandwidths of the users are completely overlapped, and the OCC is used for enhancing the orthogonality of the reference signals, the SGH/SH technology can be used, so that the orthogonality of the uplink reference signals can be ensured, and a good adjacent cell interference randomization effect can be ensured.
The present inventors found in their research that whether the bandwidths of multiple users scheduled by the base station at the same time are completely overlapped is related to the number of layers of uplink MIMO transmission for these users, which is explained in detail below.
When the number of uplink MIMO data transmission layers of a user is less than or equal to a preset layer number threshold (marked as N)L) When the OCC is used, the gain of uplink data transmission is relatively small; when the number of layers is more than NLA more pronounced gain can be observed. Therefore, when the number of uplink MIMO data transmission layers of one user is less than or equal to NLWhen the user is NLThe reference signals of the layers configure the same OCC. Here, N of the same userLThe reference signals of a layer use the same OCC, and when there is a MU-MIMO user, this MU-MIMO user may be assigned to use another OCC to increase the reference signal orthogonality. When the number of layers is more than NLIn order to improve orthogonality between reference signals of respective layers, two OCCs need to be used for reference signals of respective layers configuring the same user. According to the simulation result in the current LTE-A, NLMay be equal to 2.
Recording the number of uplink MIMO data transmission layers of one user as L, if L is more than NLThen the user uses two OCCs simultaneously, e.g. can be atThe reference signal of each layer uses the first OCC and is in
The reference signal of each layer uses the second OCC. For OCC allocation, the use of two OCCs by the same user means that the lengths of the reference signal sequences corresponding to the two OCCs are equal. Thus, if the base station schedules other users on the resources allocated to this user at the same time, the bandwidth allocated to these other users must completely overlap the bandwidth allocated to this user, regardless of the number of layers of MIMO transmission for these other users. This is because there are only two OCCs available in the system and all OCCs are already used for this user, that is, the OCCs used by other users are at least the same as one of the OCC codes of this user, and if the allocated bandwidths do not completely overlap, the orthogonality between reference signals extended with the same OCC is not good, which may degrade the performance of uplink channel estimation and the performance of uplink data transmission.
In summary, it can be seen that whether the bandwidths of the users are completely overlapped is related to the number of uplink MIMO transmission layers of the users, and when the number of uplink MIMO transmission layers of at least one user is greater than the preset layer number threshold (N)L) When the system is used, the bandwidths of a plurality of users scheduled at the same time are completely overlapped; when the number of uplink MIMO transmission layers of the user is less than or equal to a preset layer number threshold value (N)L) Then the bandwidths of multiple users scheduled simultaneously do not necessarily overlap completely.
However, in the current LTE system, a person skilled in the art does not find a relationship between whether user bandwidths are overlapped and the number of uplink MIMO transmission layers, and cannot transmit an uplink reference signal by using the method provided by the present invention according to the relationship. Specifically, in the prior art, cell-specific SGH/SH information is defined that configures the SGH/SH, which acts on both the Physical Uplink Shared Channel (PUSCH) and the Physical Uplink Control Channel (PUCCH). LTE users can only configure SGH/SH based on cell-specific SGH/SH information. The cell-specific SGH/SH information is used to indicate that the SGH/SH is turned on or off. For LTE-A users, besides the cell-specific SGH/SH information, SGH/SH can be configured by combining the SGH/SH configuration information special for the LTE-A users. The LTE-a user specific SGH/SH configuration information is also used to indicate SGH/SH on or off, but it only works on the premise that the cell specific SGH/SH information indicates SGH/SH on. For example, if the cell-specific SGH/SH information indicates that the SGH/SH is open, when the LTE-a user-specific SGH/SH configuration information also indicates that the SGH/SH is open, the LTE-a user opens the SGH/SH according to the information; when the special SGH/SH configuration information of the LTE-A user indicates that the SGH/SH is closed, the LTE-A user closes the SGH/SH according to the information; when the cell-specific SGH/SH information indicates that the SGH/SH is closed, the LTE-A user closes the SGH/SH according to the information no matter the special SGH/SH configuration information of the LTE-A user indicates that the SGH/SH is opened or closed. It can be seen that, because the relationship between whether user bandwidths are overlapped and the number of uplink MIMO transmission layers is not known, in the prior art, when transmitting uplink reference signals, different situations of the number of MIMO transmission layers are not considered, and LTE-a users must determine whether to open an SGH/SH according to cell-specific SGH/SH information and LTE-a user-specific SGH/SH configuration information, so that a technical bias exists in the prior art, which directly leads to a complicated process and more required information for the LTE-a users to determine whether to open the SGH/SH in the existing method for transmitting uplink reference signals.
According to the above, the present invention provides a method for transmitting an uplink reference signal, and as shown in fig. 1, a flowchart of the method for transmitting an uplink reference signal of the present invention includes:
step 101: determining the number of layers of current uplink MIMO data transmission; when the number of layers is less than or equal to a preset number of layers threshold (N)L) If so, executing step 102; when the number of layers is more than NLThen step 103 is executed.
Step 102: and setting reference signal sequences on two uplink reference signal symbols in the subframe according to the cell specific SGH/SH information and the special SGH/SH configuration information of the LTE-A user, and ending the current process.
Step 103: and setting reference signal sequences on two uplink reference signal symbols in the subframe according to the cell-specific SGH/SH information.
Specifically, when the cell-specific SGH/SH information indicates to turn off SGH/SH, SGH/SH is not performed for all users for both PUSCH and PUCCH transmission. When the cell-specific SGH/SH information indicates to open the SGH/SH, for the LTE user, the LTE user works according to the SGH/SH opening so as to keep backward compatibility; for a user of LTE-a, as shown in fig. 1, whether the user performs SGH/SH is determined according to the number of layers of uplink MIMO transmission of the user.
In step 102, when the cell-specific SGH/SH information indicates to turn on the SGH/SH, a configuration method of the SGH/SH is determined according to the cell-specific SGH/SH information and the LTE-a user-specific SGH/SH configuration information. The LTE-a user-specific SGH/SH configuration information may be cell-specific or user-specific, and may be transmitted through a higher layer signaling or a Physical Downlink Control Channel (PDCCH).
In addition, in step 102, it is also determined which values of the CS domain in the DCI format can be currently used for mapping of the PHICH channel.
In step 103, when the number of layers is greater than NLIn time, reference signal sequences on two uplink reference signal symbols in a subframe are set only according to cell-specific SGH/SH information, and all values of the CS domain in the DCI format can be used for mapping of the PHICH channel.
Specifically, when the cell-specific SGH/SH information indicates that the SGH is turned on, the user determines the base sequence of the reference signal in each slot according to the cell-specific sequence group hopping pattern, and determines the CS and OCC of the reference signal of each layer of MIMO transmission in combination with the information of the CS domain in the DCI format, thereby determining the reference signal sequence to be transmitted on each reference signal symbol in the subframe. When the cell-specific SGH/SH information indicates SH to be opened, and when the number of PRBs allocated by the base station is less than 6, because only one basic sequence is in a basic sequence group configuring the cell, the basic sequences of two reference signal symbols in a subframe are the same, and the CS and OCC of the reference signal of each layer of MIMO transmission are determined according to the information of the CS domain in the DCI format, so that the reference signal sequence to be transmitted on each reference signal symbol in the subframe is determined; when the number of PRBs allocated by the base station is greater than or equal to 6, because the base sequence group configuring the cell includes two base sequences, the two reference signal symbols in the subframe adopt different base sequences, and then the CS and OCC of the reference signal of each layer of MIMO transmission are determined according to the information of the CS domain in the DCI format, thereby determining the reference signal sequence to be transmitted on each reference signal symbol in the subframe.
The method of the present invention may only act on the PUSCH, and the present invention does not limit the processing method for the PUCCH.
The method of the invention is essentially that the base station sends cell specific SGH/SH information and also has the number of layers of uplink MIMO transmission less than or equal to NLThe LTE-A user sends SGH/SH configuration information special for the LTE-A user; and the number of layers for uplink MIMO transmission is greater than NLThe LTE-A user does not need the SGH/SH configuration information special for the LTE-A user.
In the invention, the base station sends the SGH/SH configuration information special for the LTE-A user to the LTE-A user, and can instruct to open the SGH/SH or close the SGH/SH. Here, SGH open means that a group of basic sequences in each slot in one frame hops according to a cell-specific pattern, and SH open means that two reference signal symbols in one subframe respectively use two basic sequences in the same group; correspondingly, SGH turned off means that the basic sequence sets in the slots in a frame are the same, and SH turned off means that the basic sequences in the slots in a frame are the same. Or, the SGH/SH configuration information dedicated to the LTE-a user of the LTE-a user may refer to that the SGH/SH is turned on to operate in LTE, or that the hopping of the basic sequence group or the basic sequence hopping is configured according to a new method. Here, the new method for configuring the hopping of the basic sequence group may mean that two reference signal symbol sequences of each subframe belong to the same basic sequence group, but the basic sequence group is configured to hop according to a cell-specific pattern in a subframe; the new method for configuring the base sequence hopping may mean that two reference signal symbol sequences of each subframe use the same base sequence, but different base sequences within a base sequence group are used in a frame varying in units of subframes.
The following detailed description refers to specific embodiments.
The first embodiment is as follows:
in this embodiment, in addition to the cell-specific SGH/SH information, the base station transmits LTE-a user-specific SGH/SH configuration information to the LTE-a user in the PDCCH. In order to reduce signaling overhead, an existing information field may be multiplexed in a DCI format to carry SGH/SH configuration information dedicated to the LTE-a user, which is used to instruct the SGH/SH to turn on or off. For example, the information of CS, OCC and SGH/SH are indicated simultaneously with a 3-bit CS domain in a DCI format. Thus, the specific manner of the embodiment is as follows:
when the cell-specific SGH/SH information indicates that SGH/SH is turned off, SGH/SH is not performed for all users for their PUSCH and PUCCH transmissions. When the cell-specific SGH/SH information indicates to open the SGH/SH, for the LTE user, the LTE user works according to the SGH/SH opening so as to keep backward compatibility; for the user of LTE-A, whether the user executes SGH/SH is determined according to the number of layers of uplink MIMO transmission of the user.
When the number of layers is less than or equal to NL(NLMay be equal to 2), the 8 values of the 3-bit CS domain in the DCI format may be divided into two groups, e.g., 4 values each, to indicate SGH/SH to be turned on or off, respectively. Specifically, the LTE-a user-specific SGH/SH configuration information is transmitted by selectively using values of one set of CS domains, wherein the values of one set of CS domains indicate that the SGH/SH is turned on, and the values of the other set of CS domains indicate that the SGH/SH is turned off. When the bandwidths of a plurality of users performing MU-MIMO are completely overlapped by base station scheduling, the SGH/SH can be opened while the reference signal orthogonality is increased by using OCC; when the bandwidths of multiple users performing MU-MIMO are not completely overlapped when the base station schedules, the SGH/SH needs to be turned off when OCC is used to increase the orthogonality of the reference signals. In this way, the base station may schedule uplink data transmission using one of a set of values of the CS domain indicating the SGH/SH is on when their bandwidths are completely overlapped according to the bandwidth situation of currently allocated individual MU-MIMO users; when they are in useWhen the bandwidths do not completely overlap, uplink data transmissions may be scheduled using one of a set of CS domain values that indicate SGH/SH turn off. Thus, on each specific subframe, only one set of values (4 values) of the CS domain can be actually used for mapping of the PHICH channel. When the SGH/SH is opened, mapping PHICH by adopting the values of the group of CS domains indicating the opening of the SGH/SH; and when the SGH/SH is closed, mapping PHICH by adopting the value of the group of CS domains indicating the closing of the SGH/SH. In LTE, all 8 values of the CS domain can be used for mapping the PHICH channel, so the uplink scheduling flexibility is limited to a little bit here.
When the number of layers is more than NLAnd only setting the SGH/SH according to the cell-specific SGH/SH information. Since the cell-specific SGH/SH information indicates that the SGH/SH is turned on, this user first determines the base sequences on two reference signal symbols within the subframe, then determines the CS and OCC of the reference signals of the respective layers according to the value of the 3-bit CS domain in the DCI format, and thus determines the reference signal sequence to be transmitted on each reference signal symbol within the subframe. When the base station allocates a PHICH channel to be used for uplink data transmission of a user, the PHICH channel is mapped by selecting one from 8 values of a 3-bit CS domain in a DCI format, and thus PHICH mapping operation in LTE is consistent. And the number of layers is less than or equal to NLIn comparison with the latter case, the PHICH channel can be allocated only using a set of values (4 values) of the CS domain in a specific subframe, so the method of the present invention can increase the degree of freedom in allocating the PHICH channel and thus improve scheduling flexibility.
For this method of indicating CS, OCC and LTE-a user-specific SGH/SH configuration information simultaneously with a 3-bit CS field in a DCI format, as described above, 8 values of the 3-bit CS field may be divided into two groups, e.g., 4 values each, to indicate SGH/SH to be turned on or off, respectively. Only 4 of the 8 values of the CS domain can be actually used for PHICH mapping on each specific subframe. In LTE, the PHICH channel is indexed by an index pair
Is identified, wherein
Is an index of the PHICH group,
is an index of an orthogonal sequence within the PHICH group. Thus, the PHICH channel of an uplink data transmission map is determined by the following equation:
here, n isDMRSRefers to a value of a 3-bit CS domain in a DCI format,
refers to a spreading factor of the PHICH channel,
refers to the minimum PRB index of the PUSCH allocated by the base station,
refers to the total number of PHICH groups, IPHTCHIs a TDD specific parameter.
According to a PHICH mapping formula in LTE, for the above method of dividing the values of 8 CS domains into two groups and respectively indicating SGH/SH to be turned on or turned off, a simple method is to make the CS values of each group be continuous values, for example, CS values 0-3 indicate that SGH/SH is turned on, and CS values 4-7 indicate that SGH/SH is turned off. Fig. 2 is a schematic diagram of CS mapping PHICH when a continuous grouping manner is adopted, wherein fig. 2A on the left side shows a result of mapping PHICH with values of one group of CS, and fig. 2B on the right side shows a result of mapping PHICH with values of another group of CS. In fig. 2, squares with slashes indicate PHICH sequence indexes mapped thereto, and blank squares indicate PHICH sequence indexes not mapped thereto; for example, taking the first column of FIG. 2A on the left as an example, when the value of CS (in n)DMRSRepresents) is 0, the mapped PHICH sequence indexes are 0, 1, 2, and 3; in the left side of FIG. 2AAs an example of the second column, when the value of CS is 1, the mapped PHICH sequence indexes are 1, 2, 3, and 4; and so on. Obviously, the probability that the respective PHICH sequence indices within each group are mapped to is very different, e.g., sequence index 3 is mapped with 4 times probability, while sequence index 7 cannot be mapped, and this non-uniform PHICH mapping limits the freedom of PHICH allocation and scheduling flexibility.
In order to solve the above problem, the present embodiment proposes another method for dividing values of a CS domain, which specifically includes: dividing the values of 8 CS domains in the DCI format into four pairs, wherein the difference of the values of 2 CS domains in each pair is 4; the arbitrary 2 pairs are grouped into one group, and the remaining 2 pairs are grouped into another group.
Specifically, the values of 8 CS domains (including 0, 1, 2, 3, 4, 5, 6, 7) are divided into 4 pairs, which are: 0 and 4, 1 and 5, 2 and 6, 3 and 7; any 2 pairs of them are combined into one group, and the remaining 2 pairs are combined into another group. Thus, there may be specifically 3 combinations including:
the first method comprises the following steps: the first set of CS values comprises 0, 2, 4, and 6, and the second set of CS values comprises 1, 3, 5, and 7;
and the second method comprises the following steps: the first set of CS values comprises 0, 1, 4, and 5, and the second set of CS values comprises 2, 3, 6, and 7;
and the third is that: the first set of CS values comprises 0, 3, 4, and 7, and the second set of CS values comprises 1, 2, 5, and 6;
after the grouping mode is adopted, uniform PHICH mapping can be ensured, so that the freedom degree and scheduling flexibility of PHICH distribution are ensured. Taking the first partitioning method as an example, fig. 3 is a schematic diagram of CS mapping PHICH when the first grouping method of the first embodiment is adopted, wherein fig. 3A on the left side shows a schematic diagram of a result of mapping PHICH with values of one set of CS, and fig. 3B on the right side shows a schematic diagram of a result of mapping PHICH with values of another set of CS. In fig. 3, squares with slashes indicate PHICH sequence indexes mapped thereto, and blank squares indicate PHICH sequence indexes not mapped thereto; for example, take the first column of FIG. 3A on the left as an example, whenValue of CS (in n)DMRSRepresents) is 0, the mapped PHICH sequence indexes are 0, 1, 2, and 3; taking the second column in the left diagram a as an example, when the value of CS is 2, the PHICH sequence indexes mapped to are 2, 3, 4, 5; and so on. Obviously, the probability that the respective PHICH sequence indexes within each group are mapped is equal. This way, it is guaranteed that for each group of CS domain values, the PHICH channel can be mapped uniformly by the 4 CS domain values in this group and the minimum PRB index for uplink data transmission, thereby increasing uplink scheduling flexibility. With regard to the second and third party grouping methods, the probability that each PHICH sequence index in each group is mapped to is also guaranteed to be equal, and this embodiment does not perform verification by mapping.
The above method for grouping values of the CS domain can be used only for MIMO transmission with the number of layers less than NLThe method of configuring SGH/SH of the present invention can also be used in other methods of configuring SGH/SH, for example, in the case of all MIMO transmission layers, the method is used to distinguish SGH/SH and map PHICH channel.
Example two:
in this embodiment, in addition to the cell-specific SGH/SH information, SGH/SH configuration information dedicated to LTE-a users is transmitted to LTE-a users by higher layer signaling. This LTE-a user specific SGH/SH configuration information may be cell specific, i.e. acting on all LTE-a users in the cell simultaneously; alternatively, the dedicated SGH/SH configuration information for the LTE-a user may also be user specific, i.e. sent directly to each user via Radio Resource Control (RRC) signaling. Thus, the operation mode of the embodiment may be:
when the cell-specific SGH/SH information indicates that SGH/SH is turned off, SGH/SH is not performed for all users for their PUSCH and PUCCH transmissions. When the cell-specific SGH/SH information indicates to open the SGH/SH, for the LTE user, the LTE user works according to the SGH/SH opening so as to keep backward compatibility; for the user of LTE-A, whether the user executes SGH/SH is determined according to the number of layers of uplink MIMO transmission of the user.
When the number of layers is less than or equal to NL(NLMay be equal to 2), setting reference signal sequences on two uplink reference signal symbols in the subframe according to the cell-specific SGH/SH information and the SGH/SH configuration information dedicated to the LTE-a user, and determining CS and OCC of the reference signal of each layer according to the value of the 3-bit CS domain in the DCI format, thereby determining the reference signal sequence to be transmitted on each reference signal symbol in the subframe. In this case, when the base station allocates the PHICH channel used for uplink data transmission of the user, all 8 values of the 3-bit CS domain in the DCI format can be used to map the PHICH channel, which is consistent with the PHICH mapping operation in LTE.
When the number of layers is more than NLAnd only setting the SGH/SH according to the cell-specific SGH/SH information. Since the cell-specific SGH/SH information indicates that the SGH/SH is turned on, this user first determines the base sequences on two reference signal symbols within the subframe, then determines the CS and OCC of the reference signals of the respective layers according to the value of the 3-bit CS domain in the DCI format, and thus determines the reference signal sequence to be transmitted on each reference signal symbol within the subframe. When the base station allocates the PHICH channel used for uplink data transmission of the user, 8 values of the 3-bit CS domain in DCI format 0 may all be used to map the PHICH channel, so that the PHICH mapping operation in LTE is consistent. Here, even if the SGH/SH configuration information dedicated to the LTE-a user of the LTE-a user is an instruction to turn off the SGH/SH, the LTE-a user can still operate with the SGH/SH turned on.
By this method, when the number of layers is larger than NLAnd when the user opens the SGH or SH according to the specific SGH/SH information of the cell, thereby being beneficial to increasing the inter-cell interference randomization effect. In particular, when the base station is currently actually scheduling SU-MIMO transmissions, making this number of layers greater than NLThe user opens the SGH or SH according to the specific SGH/SH information of the cell, which is beneficial to increasing the inter-cell interference randomization effect.
In summary, in the method for transmitting uplink reference signals provided by the present invention, when setting an uplink reference signal sequence, whether a user performs SGH/SH is determined according to the number of layers of uplink MIMO transmission of the user, so that the uplink reference signal orthogonality is enhanced while the SGH/SH technique is used as much as possible, and a better neighboring cell interference randomization effect is ensured. Meanwhile, the invention can also increase the degree of freedom of PHICH channel mapping so as to improve the scheduling flexibility.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for transmitting uplink reference signals, the method comprising:
determining the number of layers of current uplink MIMO data transmission;
when the number of layers is less than or equal to a preset number of layers threshold value, setting reference signal sequences on two uplink reference signal symbols in a subframe according to the hopping SGH/basic sequence hopping SH information of the cell specific basic sequence group and the special SGH/SH configuration information of a long term evolution enhanced LTE-A user;
and when the layer number is greater than the preset layer number threshold value, setting reference signal sequences on two uplink reference signal symbols in the subframe according to the cell specific SGH/SH information.
2. The method of claim 1, wherein the predetermined threshold number of layers is 2.
3. The method according to claim 1 or 2, wherein the cyclic shift CS domain in the DCI format carries the SGH/SH configuration information dedicated to the LTE-a user.
4. The method of claim 3, wherein when the number of layers is less than or equal to a predetermined threshold number of layers, the values of the CS domains in the DCI format are divided into two groups, and the two groups of CS domains are used to indicate the SGH/SH is turned on or off respectively.
5. The method of claim 4, wherein the dividing the values of the CS domain in the DCI format into two groups is performed by:
dividing the values of 8 CS domains in the DCI format into four pairs, wherein the difference of the values of 2 CS domains in each pair is 4; the arbitrary 2 pairs are grouped into one group, and the remaining 2 pairs are grouped into another group.
6. The method of claim 3, wherein when the number of layers is greater than a preset number of layers threshold, a physical hybrid automatic repeat request indicator channel (PHICH) is mapped with values of all CS domains in a DCI format.
7. The method according to claim 1 or 2, wherein said LTE-a user specific SGH/SH configuration information is carried using higher layer signaling.
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| CN103179667A (en) * | 2011-12-23 | 2013-06-26 | 中兴通讯股份有限公司 | Method and device for processing cyclic shift sequence jumping and obtaining cyclic shift sequence value |
| WO2019157958A1 (en) * | 2018-02-13 | 2019-08-22 | 中兴通讯股份有限公司 | Channel state information (csi) report sending and receiving methods, device and electronic device |
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| CN103179667A (en) * | 2011-12-23 | 2013-06-26 | 中兴通讯股份有限公司 | Method and device for processing cyclic shift sequence jumping and obtaining cyclic shift sequence value |
| WO2013091490A1 (en) * | 2011-12-23 | 2013-06-27 | 中兴通讯股份有限公司 | Method and device for processing cyclic shift sequence hopping and obtaining cyclic shift sequence values |
| CN103179667B (en) * | 2011-12-23 | 2017-12-12 | 中兴通讯股份有限公司 | Cyclically shifted sequences saltus step processing, cyclically shifted sequences value-acquiring method and device |
| WO2019157958A1 (en) * | 2018-02-13 | 2019-08-22 | 中兴通讯股份有限公司 | Channel state information (csi) report sending and receiving methods, device and electronic device |
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| CN112135309A (en) * | 2020-10-22 | 2020-12-25 | 中国联合网络通信集团有限公司 | Network optimization method and device |
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