CN107425947B - Method and device for mapping reference signals and multiple access resources - Google Patents

Abstract

The application discloses a mapping method of a reference signal and a multiple access resource, which comprises the following steps: determining a reference signal used for uplink data transmission; determining multiple access resources according to the mapping relation between the reference signals and the multiple access resources; communicating using the multiple access resource. The mapping method can be also applied to a scheduling-free system, and only the root sequence index, the cyclic shift, the OCC index and the COMB index of the reference signal used for uplink data transmission are mapped by the leader sequence according to the selected leader sequence and the set rule, and then the multiple access resource is mapped according to the mapping method. The application also discloses a mapping device of the reference signal and the multiple access resource. By applying the technical scheme disclosed by the application, the signaling overhead can be reduced.

Description

Method and device for mapping reference signals and multiple access resources

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for mapping a reference signal and a multiple access resource of a multiple access system.

Background

With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT), the future mobile communication technology is challenged with unprecedented challenges. As can be expected from international telecommunication union ITU's report ITU-R M. [ imt. beyond 2020.TRAFFIC ], by 2020, mobile TRAFFIC will increase by nearly 1000 times in relation to 2010 (era 4G), and the number of user equipment connections will also exceed 170 billion, and will be even more dramatic as the vast number of IoT devices gradually permeates into mobile communication networks. To address this unprecedented challenge, the communications industry and academia have developed extensive fifth generation mobile communications technology (5G) research, facing the 2020. Future 5G frameworks and overall goals are currently discussed in ITU's report ITU-R M [ imt.vision ], wherein the 5G demand landscape, application scenarios and various important performance indicators are specified. For the new requirements in 5G, ITU's report ITU-R M [ imt. user TECHNOLOGY TRENDS ] provides information related to the technical trend for 5G, aiming at solving significant problems of significant improvement of system throughput, consistency of user experience, scalability to support IoT, latency, energy efficiency, cost, network flexibility, support of emerging services, and flexible spectrum utilization.

In the face of more diversified service scenes of 5G, a flexible multiple access technology is needed to support different scenes and service requirements. For example, in the service scenario of massive connections, how to access more users on limited resources becomes a core problem to be solved by the 5G multiple access technology. In the current 4G LTE network, Multiple Access technologies based on Orthogonal Frequency Division Multiplexing (OFDM) are mainly adopted, such as downlink Orthogonal Frequency Division Multiple Access (OFDMA) and uplink Single-carrier Frequency Division Multiple Access (SC-FDMA). However, it is obviously difficult for the existing orthogonal access method to meet the requirements of 5G that the spectrum efficiency is improved by 5-15 times and the number of user accesses per square kilometer area reaches the million level. The Non-orthogonal Multiple Access (NOMA) technology can greatly increase the number of supported user connections by multiplexing the same resource by a plurality of users. As the users have more chances to access, the overall throughput and the spectrum efficiency of the network are improved. Furthermore, in the face of a large Machine Type Communication (mtc) scenario, it may be necessary to use a multiple access technique with simpler operation processing in consideration of cost and implementation complexity of a terminal. In the face of a low-delay or low-power-consumption service scene, a non-orthogonal multiple access technology is adopted, so that scheduling-free competitive access can be better realized, low-delay communication is realized, the starting time is shortened, and the power consumption of equipment is reduced.

Non-orthogonal multiple access techniques that are mainly being studied today are: multiple User Shared Access (MUSA), Multiple User Superposition Transmission (MUST), Pattern Division Multiple Access (PDMA), Sparse Code Division Multiple Access (Sparse Code Multiple Access, SCMA), Resource Spread Multiple Access (Resource Spread Multiple Access, RSMA), Non-orthogonal Code Division Multiple Access (Non-orthogonal Code Multiple Access, NCMA), Non-orthogonal Code Division Multiple Access (NOCA), orthogonal Code Division Multiple Access (interlace), IDMA), and Interleaved Grid Multiple Access (IGMA), among others. The MUSA, NCMA and NOCA distinguish users by means of code words, the SCMA distinguishes users by means of codebooks, the MUST distinguishes users by means of power, the PDMA distinguishes users by means of different characteristic patterns, the IDMA distinguishes different users by means of interleaving sequences, and the IGMA distinguishes different users by means of interleaving sequences and grid mapping. For details of IDMAs reference may be made briefly to an earlier document: li Ping, Lihai Liu, Keying Wu and W.K. Leung, "Interactive Division Multiple Access", IEEE Transactions on Wireless Communication, Vol.5, No.4, pp.938-947, Apr.2006.

Unlike the conventional Orthogonal Frequency Division Multiple Access (OFDMA) system, in a novel non-Orthogonal Multiple Access system (e.g., IDMA, IGMA, SCMA, PDMA, and RSMA), a base station needs to inform a terminal of not only a DeModulation Reference Signal (DMRS) used by the terminal but also resources (e.g., an interleaver, a codebook, and/or a mode mapping pattern) allocated to the terminal through control signaling. For example, in an IDMA system, assuming that 8 different interleavers can simultaneously access 8 users, it is necessary to refer to the interleaver used for accessing each user by using 3 bits as an index, so that the total overhead is 8 × 3 — 24 bits. By analogy, when the system has N available resources, the total cost required for accessing K users is K log₂N bits. It can be seen that whenWhen a large number of terminals are accessed in the system, a large amount of additional signaling overhead is needed, meanwhile, the data transmission delay is increased, and the throughput of the system is reduced. Therefore, how to reduce the signaling overhead is an important factor for promoting the evolution of the multiple access technology.

Disclosure of Invention

The application provides a mapping method of a reference signal and a multiple access resource, so as to reduce signaling overhead.

The application provides a mapping method of a reference signal and a multiple access resource, which comprises the following steps:

determining a reference signal used for uplink data transmission;

determining multiple access resources according to the mapping relation between the reference signals and the multiple access resources;

communicating using the multiple access resource.

Preferably, the determining the multiple access resource according to the mapping relationship between the reference signal and the multiple access resource includes: and determining corresponding multiple access resources according to a set mapping rule by taking the parameter for generating the reference signal as an index.

Preferably, if the multiple access resource is an interleaver, when T1 parameters among the parameters are used as indexes, where 1 is greater than or equal to T1 is greater than or equal to 4, the determining the corresponding multiple access resource according to the set mapping rule includes:

and generating a next-stage mother interleaver by using a prestored mother interleaver as a first-stage mother interleaver and using any unused parameter of the T1 parameters as an index according to a set rule, and so on until the last unused parameter of the T1 parameters is used as an index to generate an interleaver for multiple access.

Preferably, if the multiple access resource is power, when T2 parameters of the parameters are used as indexes, where T2 is greater than or equal to 1 and less than or equal to 4, the determining the corresponding multiple access resource according to the set mapping rule includes:

and taking a pre-agreed power reference as a first-stage power reference, generating a next-stage power reference by using any unused parameter of the T2 parameters as an index according to a set rule, and repeating the steps until the last unused parameter of the T2 parameters is used as an index to generate power for multiple access.

Preferably, when the multiple access resource is any one of or a combination of at least two of the following: spatial resources, bit-level interleavers, symbol-level interleavers, power, non-orthogonal codebooks, scrambling codes, mode mapping patterns,

if 1 parameter of the reference signal is used as an index, the parameter for generating the reference signal is used as an index, and the determining of the corresponding multiple access resource according to the set mapping rule comprises the following steps: selecting corresponding multiple access resources according to the parameters;

if 2 parameters of the reference signal are used as indexes, the method further comprises: dividing the multiple access resources into N₁Groups of N₂A resource; wherein N is₁And N₂The number of the first parameter and the number of the second parameter in the 2 parameters are respectively; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of multiple access resources according to the first parameter, and selecting the multiple access resources used in the selected group according to the second parameter; and/or

If 3 parameters of the reference signal are used as indexes, the method further comprises: grouping the multiple access resources into N layers₁Groups of N₂*N₃A resource; grouping the first layer into N groups₂*N₃A resource is grouped into a second layer of N₂Groups, each group comprising N₃A resource; wherein N is₁、N₂And N₃The number of the first parameter, the second parameter and the third parameter in the 3 parameters are respectively; the mapping out the corresponding multiple access resource according to the set mapping rule by taking the parameter for generating the reference signal as an index comprises: selecting a multiple access resource at a first level based on a first parameterThe group of the group is divided into a second layer group according to the second parameter, and the used multiple access resource is selected in the selected fourth layer group according to the third parameter; and/or

If 4 parameters of the reference signal are used as indexes, the method further comprises: grouping the multiple access resources into N layers₁Groups of N₂*N₃*N₄A resource; grouping the first layer into N groups₂*N₃*N₄A resource is grouped into a second layer of N₂Groups, each group comprising N₃*N₄A resource; grouping the second layers into N of each group₃*N₄The resources are grouped into a third layer of N₃Groups, each group comprising N₄A resource; wherein N is₁、N₂、N₃And N₄The number of the first parameter, the second parameter, the third parameter and the fourth parameter in the 4 parameters are respectively; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of the multiple access resources grouped in the first layer according to the first parameter, selecting a group of the multiple access resources grouped in the second layer according to the second parameter, selecting a group of the multiple access resources grouped in the third layer according to the third parameter, and selecting the used multiple access resources in the selected group of the third layer according to the fourth parameter.

Preferably, when a terminal transmits at least two data streams on the same time-frequency resource, the determining the corresponding multiple access resource according to the set mapping rule by using the parameter for generating the reference signal as an index further includes: and taking the interleaver for multiple access as a last-stage mother interleaver, and generating the interleaver used by each data stream according to the index of the data stream according to a set rule based on the last-stage mother interleaver.

Preferably, when a terminal transmits at least two data streams on the same time-frequency resource, the determining the corresponding multiple access resource according to the set mapping rule by using the parameter for generating the reference signal as an index further includes: and taking the power for multiple access as the last-stage power reference, and generating the power used by each data stream according to the index of the data stream according to a set rule based on the last-stage power reference.

Preferably, for the case of using 1 parameter of the reference signal as an index, when one terminal transmits at least two data streams on the same time-frequency resource, the method further includes: dividing the multiple access resources into N₁Groups, each group comprising N_sA resource; wherein N is₁Is the number of the 1 parameter, N_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of multiple access resources in the first layer grouping according to the first parameter, and selecting the multiple access resources used by each data stream in the selected second layer grouping group according to the index of the data stream; and/or

For the case of using 2 parameters of the reference signal as an index, when one terminal transmits at least two data streams on the same time-frequency resource, the method further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N_sA resource; n of each group₂*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N_sA resource; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of the multiple access resources grouped in a first layer according to a first parameter, selecting a group of the multiple access resources grouped in a second layer according to a second parameter, and selecting the multiple access resources used by each data stream in the selected group of the second layer according to the index of the data stream; and/or

For the case of using 3 parameters of the reference signal as indices, when one is usedWhen the terminal transmits at least two data streams on the same time-frequency resource, the method further comprises: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N₃*N_sA resource; grouping the first layer into N groups₂*N₃*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N₃*N_sA resource; grouping the second layers into N of each group₃*N_sThe resources are grouped into a third layer of N₃Groups, each group comprising N_sA resource; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of multiple access resources grouped in a first layer according to a first parameter, selecting a group of multiple access resources grouped in a second layer according to a second parameter, selecting a group of multiple access resources grouped in a third layer according to a third parameter, and selecting the multiple access resources used by each data stream in the selected group of the third layer according to the index of the data stream; and/or

For the case of using 4 parameters of the reference signal as an index, when one terminal transmits at least two data streams on the same time-frequency resource, the method further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N₃*N₄*N_sA resource; grouping the first layer into N groups₂*N₃*N₄*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N₃*N₄*N_sA resource; grouping the second layers into N of each group₃*N₄*N_sThe resources are grouped into a third layer of N₃Groups, each group comprising N₄*N_sA resource; grouping the third layer into N of each group₄*N_sThe resource is grouped into N₄Groups, each group comprising N_sA resource; wherein N is_sBeing the same for each terminalThe maximum number of data streams which can be transmitted on the time-frequency resources; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting the grouping of the multiple access resources in the first layer according to the first parameter, selecting the grouping of the multiple access resources in the second layer according to the second parameter, selecting the grouping of the multiple access resources in the third layer according to the third parameter, selecting the grouping of the multiple access resources in the fourth layer according to the fourth parameter, and selecting the multiple access resources used by each data stream in the selected grouping group of the fourth layer according to the index of the data stream.

Preferably, when the multiple access resource is a combination of a bit-level interleaver and at least one of the following: the method comprises the following steps of determining corresponding multiple access resources according to a set mapping rule by using parameters for generating the reference signal as indexes, wherein the parameters comprise the following steps:

and respectively determining corresponding interleavers for multiple access and other multiple access resources according to a set mapping rule by taking all or part of parameters for generating the reference signals as indexes.

Preferably, when the multiple access resource is a combination of power and at least one of the following: the method comprises the following steps of determining corresponding multiple access resources according to a set mapping rule by using parameters for generating the reference signal as indexes, wherein the parameters comprise:

and respectively determining corresponding power for multiple access and other multiple access resources according to a set mapping rule by taking all or part of parameters for generating the reference signals as indexes.

Preferably, when the total number of multiple access resources is smaller than the total number of reference signals, the method further comprises: and the total number of the multiple access resources is equal to the total number of the reference signals in a copying mode, and the copied multiple access resources are subjected to corresponding grouping operation.

Preferably, when the total number of the multiple access resources is less than the product of the total number of the reference signals and the maximum number of transmission streams of the terminal, the method further comprises: and performing corresponding grouping operation on the copied multiple access resources by making the total number of the multiple access resources equal to the product of the total number of the reference signals and the maximum transmission stream number of the terminal in a copying mode.

Preferably, in a system without scheduling, the method further comprises: and determining the parameters according to the selected leader sequence and the set rule by the mapping relation of the leader sequence and the parameters for generating the reference signals used by the uplink data transmission, wherein the number of the parameters is 1-4.

Preferably, the parameters of the preamble sequence and the reference signal used for generating uplink data transmission include:

if the number of the parameters is 1, determining the parameters by using the leader sequence;

if the number of the parameters is 2, the leader sequence is grouped into N layers₁₁Group (d); determining a sixth parameter of the 2 parameters by using the position of the selected preamble sequence in the first layer packet, and determining a fifth parameter of the 2 parameters by using the first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁The number of the fifth parameters; and/or

If the number of the parameters is 3, the leader sequence is grouped into N layers₁₁Group (d); performing second layer grouping on the leader sequence in each group of the first layer grouping into N₂₁Group (d); determining a seventh parameter of the 3 parameters using a position of the selected preamble sequence in the second layer packet, determining a sixth parameter of the 3 parameters using a second layer packet group to which the selected preamble sequence belongs, and determining a fifth parameter of the 3 parameters using a first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁Is the number of the fifth parameter, N₂₁The number of the sixth parameters; and/or

If the number of the parameters is 4, the leader sequence is grouped into N layers₁₁Group (d); grouping the first layer into preamble sequences in each groupPerforming layer two grouping into N₂₁Group (d); performing third layer grouping on the leader sequence in each group of the second layer grouping into N₃₁Group (d); determining an eighth parameter of the 4 parameters using a position of the selected preamble sequence in the third layer packet, determining a seventh parameter of the 4 parameters using a third layer packet group to which the selected preamble sequence belongs, determining a sixth parameter of the 4 parameters using a second layer packet group to which the selected preamble sequence belongs, and determining a fifth parameter of the 4 parameters using a first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁Is the number of the fifth parameter, N₂₁The number of the sixth parameters; n is a radical of₃₁Is the number of the seventh parameter.

The present application further provides a mapping device for reference signals and multiple access resources, including:

a reference signal determining module, configured to determine a reference signal used for uplink data transmission;

the mapping module is used for determining the multiple access resources according to the mapping relation between the reference signals and the multiple access resources;

a transmission module, configured to perform communication using the multiple access resource.

Preferably, the reference signal determining module is further configured to determine, according to the selected preamble sequence, a reference signal used for uplink data transmission according to a set rule.

According to the technical scheme, the method for determining the mapping relation between the reference signal and the resource pool enables the base station and the terminal to obtain the corresponding multiple access resource information through the allocated reference signal, so that extra signaling overhead and transmission delay are avoided. The mapping method of the present invention can dynamically obtain corresponding multiple access resources (which can be one-to-one, one-to-many, or many-to-one mapping) according to the generation method of the reference signal and the application scenario. The invention can be applied to a scheduling-free system to simplify the process and reduce the complexity.

Drawings

FIG. 1 is a flow chart of mapping based on a scheduling system according to the present application;

FIG. 2 is a flow chart of the mapping process based on the dispatch-free system according to the present application;

FIG. 3 is a flow chart of mapping for obtaining an interleaver based on a root sequence and a cyclic shift of a reference signal according to the present application;

fig. 4 is a schematic block diagram of a sending end of the IGMA system according to the present application;

FIG. 5 is a flow chart of mapping for obtaining an interleaver based on a root sequence, cyclic shift, OCC and COMB of a reference signal according to the present application;

fig. 6 is a schematic diagram illustrating a mapping manner of the number of transmission data streams to the interleaver according to the present application;

fig. 7 is a schematic structural diagram of a mapping apparatus for reference signals and multiple access resources according to the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.

Currently, research on multiple access technologies focuses on link and system level performance simulation and verification. In the future, no matter what multiple access technology is adopted by the standard, how to reduce the system overhead will be a considerable problem. In a practical system, a user performs channel detection and estimation (such as Sounding Reference Signal (SRS) and DeModulation Reference Signal (DMRS)) by using different Reference signals, thereby completing DeModulation of a received Signal. Therefore, the present application provides a mapping method of reference signals and multiple access resources, so that the base station and the terminal can obtain corresponding multiple access resource information through the allocated reference signals, thereby reducing signaling overhead. The mapping method of the invention can dynamically obtain corresponding multiple access resources (which can be one-to-one, one-to-many or many-to-one mapping) according to the generation mode of the reference signal and the application scene. The invention can also be applied in a dispatch-free system to simplify the flow and reduce the complexity.

Considering a scheduling-based system first, fig. 1 is a basic flowchart of a mapping method based on a scheduling system according to the present invention. As shown in fig. 1, the method comprises the following main steps:

step 1: the base station allocates a reference signal to each terminal through a Physical Downlink Control Channel (PDCCH).

Step 2: and the base station and the terminal respectively map corresponding multiple access resources according to the indexes of the allocated reference signals by the mapping mode.

And step 3: the terminal sends the allocated reference signal to the base station, and the base station performs channel estimation by using the received signal.

And 4, step 4: and the terminal uses the multiple access resources to communicate with the base station according to an agreed transmission mode.

The main innovation point of the present invention is that the mapping according to the allocated reference signal in step 2 obtains the corresponding multiple access resource, which specifically includes:

1) for a system using an interleaver as a multiple access resource, for example, an IDMA system, when T1 parameters in the parameters for generating reference signals are used as indexes (wherein, 1 ≦ T1 ≦ 4), both the transceiver and the transceiver use a pre-stored mother interleaver as a first-stage mother interleaver, and according to a certain rule, any unused parameter in the T1 parameters is used as an index to generate a next-stage mother interleaver, and so on until the last unused parameter in the T1 parameters is used as an index to generate an interleaver for multiple access.

2) For a system with power as the multiple access resource, for example: in the uplink power domain NOMA system, when T2 parameters in the parameters for generating the reference signal are used as indexes (wherein, T2 is more than or equal to 1 and less than or equal to 4), a transceiver and a receiver use a pre-agreed power reference as a first-stage power reference, use any one of the unused parameters of the T2 parameters as an index to generate a next-stage power reference according to a certain rule, and so on until the last unused parameter of the T2 parameters is used as an index to generate power for multiple access.

3) When the multiple access resource is any one of or a combination of at least two of the following: space resources, bit-level interleavers, symbol-level interleavers, power, non-orthogonal codebooks, scrambling codes, mode mapping patterns, such as SCMA, RSMA, MUSA, PDMA, NCMA, NOCA, IGMA, uplink power domain NOMA, uplink multi-user MIMO and other systems, grouping multiple access resource combinations by at least one layer, sequentially selecting groups of each layer group by using parameters for generating reference signals as indexes, and selecting resource combinations for multiple access in the groups.

4) When the multiple access resource is a combination of a bit-level interleaver and at least one of: the method comprises the following steps of respectively determining corresponding interleavers for multiple access and other multiple access resources according to a set mapping rule by using space resources, power, a symbol level interleaver, a non-orthogonal codebook, an orthogonal codebook, scrambling codes and a mode mapping pattern and by using all or part of parameters for generating reference signals as indexes; likewise, when the multiple access resource is a combination of power and at least one of: the method comprises the steps of using a space resource, a bit-level interleaver, a symbol-level interleaver, a non-orthogonal codebook, an orthogonal codebook, a scrambling code and a mode mapping pattern, using all or part of parameters for generating the reference signal as indexes, and respectively determining corresponding power for multiple access and other multiple access resources according to a set mapping rule.

5) When the terminal has a plurality of transmission streams, one reference signal can be mapped to a plurality of multiple access resources by using the number of data streams of each terminal based on the mapping modes 1), 2), 3) and 4).

6) When the number of multiple access resources in the system is less than the number of available reference signals, such as SCMA, RSMA, MUSA, PDMA, NCMA, NOCA, etc., the multi-to-one mapping of reference signals to multiple access resources can be implemented in an overlapping packet manner (i.e., the same multiple access resource can belong to multiple different packets, or one packet contains multiple same multiple access resources).

The present application also contemplates a system that is dispatch-free. As shown in fig. 2, which is a mapping flowchart based on a dispatch-free system according to the present application, a base station and a terminal may obtain a reference signal used in uplink data transmission according to a selected preamble sequence (preamble sequence) without scheduling, and further obtain a multiple access resource used in uplink data transmission according to the reference signal and a certain mapping rule, and then the terminal sends the used reference signal to the base station, the base station performs channel estimation by using a received signal, and the terminal communicates with the base station by using the multiple access resource in an agreed transmission manner. The mapping mode of the reference signal to the multiple access resource is the same as that of the system based on scheduling. In addition, the mapping from the preamble sequence to the reference signal is mainly characterized by: and obtaining a root sequence, a cyclic shift, an OCC and a COMB for generating the reference signal according to the sequence number of the leader sequence. One-to-one or many-to-one mapping can be dynamically implemented according to the number of preamble sequences and the number of available reference signals.

It should be noted that the multiple access resource described in the present application includes: non-orthogonal multiple access resources and orthogonal multiple access resources. That is to say: the technical scheme provided by the application is suitable for a non-orthogonal multiple access system and an orthogonal multiple access system. Specifically, as in the SCMA system having a codebook as a multiple access resource, when there are a small number of terminals in the system, orthogonal codebooks may be allocated for the respective terminals. At this time, the multiple access resources used by each terminal can still be obtained through the mapping method described in the present application. In the following embodiments, a non-orthogonal multiple access system is mainly used as an example for explanation.

The mapping method in the scheduling-based system is described in detail in the following embodiments one to five, and the mapping method in the scheduling-free system is described in detail in the sixth embodiment.

The first embodiment is as follows:

this embodiment introduces a one-to-one mapping method of a reference signal and an interleaver for IDMA. In practical systems, the reference signal is usually composed of four parameters, namely the root sequence, cyclic shift, OCC and COMB. Here, a method of mapping out the interleaver for two parameters of the reference signal is considered. The two parameters may be any two of the four reference signal composition parameters, and this embodiment describes the case where the two parameters are the root sequence and the cyclic shift. In particular, reference signal sequences

The generation is as follows:

wherein u and v are for determining root sequences

α is a cyclic shift, n is 0,1, …, T-1 is the nth sample of the reference signal, and T is the length of the reference signal. When two terminals are from different cells or Resource Blocks (RBs) occupied by the two terminals for transmitting data are different in length, reference signals allocated to the two terminals are from different root sequences; when two terminals are from the same cell and occupy the same resource block length, the reference signals allocated to the two terminals are from the same root sequence but have different cyclic shifts.

Here, the index of the reference signal root sequence is denoted as q, q is 0,1, … N_q-1, denoting the cyclic shift as α, α ═ 0,1, …, N_α-1, wherein N_qIs the number of root sequences, N_αIs the number of cyclic shifts. Thus, for a one-to-one mapping, the total number of interleavers that can be referred to is N_qN_α。

The mapping method introduced in this embodiment is shown in fig. 3, and fig. 3 is a flowchart of mapping for obtaining an interleaver based on a root sequence and cyclic shift of a reference signal, and the main process is divided into two parts: firstly, according to a mother interleaver pre-stored in a base station and a terminal, a serial number q of a reference signal root sequence is used as a first parameter, and a second-stage mother interleaver is generated according to a certain rule; then, according to the obtained second-stage mother interleaver, an interleaver for multiple access is generated according to a certain rule with the cyclic shift α of the reference signal as a second parameter. It should be noted that: in the process of generating the interleaver, the use order of the reference signal root sequence and the cyclic shift can be exchanged, namely: firstly, according to mother interleavers pre-stored in a base station and a terminal, a second-stage mother interleaver is generated according to a certain rule by using a reference signal cyclic shift alpha; then, an interleaver for multiple access is generated according to a certain rule using the sequence number q of the root sequence of the reference signal based on the obtained second-stage mother interleaver. Fig. 3 illustrates only the former case as an example. In addition, the interleaver for multiple access may be generated using only one of the two parameters, the root sequence and the cyclic shift.

As shown in FIG. 3, the second level mother interleavers generated by root sequence indexing are denoted as second level mother interleavers 0,1,2, …, N_q-1; the interleaver produced by the second stage parent interleaver 0 is denoted interleaver 0, N_q，…，(N_α-1)N_q. By analogy, the obtained index of the interleaver is denoted as k, k is 0,1, …, N_qN_α1, the mathematical expression of the above mapping method can be written as:

k＝q+α×N_q

it should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but also can be performed by using q and α in other ways in practical applications. The generation of an interleaver, i.e., the generation of exponents, is described in detail below. In the exponential mode, the kth interleaver passes through a mother interleaver pi₀And q generating interleavers pi_g1And alpha generating interleavers pi_g2Produced in cascade. The mathematical expression is as follows:

to obtain a value from (q, alpha) to pi_kThe generation interleaver needs to satisfy the following condition:

in order to satisfy the above conditions, one option for generating the interleaver is:

this is done:

wherein, an interleaver pi is generated_gThe description of (A) is as follows: the ith bit of the input sequence passes through an interleaver pi_gAnd then mapped to the i' th bit of the output sequence. Where the relationship of l to l' is:

wherein S is a spreading factor in IDMA system, N_bThe total bit length is S × N, which is the bit length after channel coding (before spreading)_b，l，l′＝0，1，…，S×N_b-1. The rule is such that the interleaver pi_gSatisfies the conditions

Where | x-y | < N_b. Since k is 0,1, …, N_qN_α-1, and k<<N_bIt can be seen that the above mapping relationship

Such that:

1) for any combination (q, α) of root sequence and cyclic shift, a unique interleaver can be obtained;

2) different interleavers may be obtained for different combinations (q, a) of root sequences and cyclic shifts.

One specific example is as follows: consider that there are 4 terminals in the system, each terminal needs to transmit 5 bits, the spreading factor is 3 (total bit length is 15), and:

π₀＝{4，1，14，9，5，15，12，6，3，13，2，11，7，8，10}

π_g＝{13，11，9，1，14，12，4，2，15，7，5，3，10，8，6}

then the interleaver generated exponentially is:

terminal 0: pi₀＝{4，1，14，9，5，15，12，6，3，13，2，11，7，8，10}

The terminal 1: pi₁＝{9，6，11，12，2，10，13，8，14，7，1，15，4，5，3}

And (3) the terminal 2: pi₂＝{12，8，15，13，1，3，7，5，11，4，6，10，9，2，14}

And (3) the terminal: pi₃＝{13，5，10，7，6，14，4，2，15，9，8，3，12，1，11}

It should be noted that, when the interleaver is mapped by only one parameter of the reference signal, the used interleaver is determined by the interleaver generating method described in this embodiment only by the parent interleaver and using the index of the parameter.

Example two:

the first embodiment introduces a mapping procedure for a system with an interleaver as a multiple access resource. In this embodiment, a system with power as a multiple access resource is considered, such as the uplink power domain NOMA. In such a system, the power control is performed to make the received power of signals transmitted by different terminals different, thereby achieving the purpose of distinguishing users. At this time, power control may be accomplished by establishing a mapping relationship with the reference signal.

The present embodiment considers a method of mapping out multiple access power from two parameters of the reference signal, i.e. the root sequence and the cyclic shift. Firstly, generating a second-level power reference according to a certain rule by using a pre-agreed power reference in a system and according to a first parameter of a reference signal; and then, generating power for multiple access according to a certain rule according to a second parameter of the reference signal by using the generated second-stage power reference. Here, the first parameter and the second parameter of the reference signal have the same meaning as in embodiment one. In this embodiment, the first parameter is a root sequence, and the second parameter is a cyclic shift. Specifically, for the root sequence index q, cyclic shift α, the index of the generated power is:

k＝q+α×N_q

wherein q is 0,1,2, …, N_q-1，N_qIs the total number of root sequences, alpha is 0,1,2, …, N_α-1，N_αIs the total number of cyclic shifts. The unit power offset is denoted as P, and the pre-determined power reference of the system is P₀Then the received power generated for multiple access is

P_k＝P₀+k×P.

It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but also can be performed by using q and α in other ways in practical applications. Furthermore, the order of use of the reference signals may be reversed, i.e. cyclic shift as the first parameter and root sequence as the second parameter. Meanwhile, the two parameters used may also be other parameters of the reference signal, i.e., COMB and OCC. When the power for multiple access is mapped out by only one parameter of the reference signal, the power for multiple access is determined in the manner described in this embodiment by only the index of the parameter through the mother power reference.

Example three:

embodiments one and two describe mapping procedures for systems with interleaver and received power as multiple access resources, respectively. In this embodiment, systems such as SCMA, MUSA, PDMA, NCMA, NOCA, and RSMA are considered as multiple access resources mapped by codebooks and/or patterns. In such systems, the resource pool (codebook design and mode mapping pattern) relies on more complex optimization algorithms and is therefore difficult to generate in a simple manner from one parent resource. It should be noted that the mapping method of the present embodiment is also applicable to a multiple access system using interleavers and/or power, especially for the case where the interleavers and power cannot be generated according to one mother interleaver or mother power reference in the manner described in the first and second embodiments. That is, the present embodiment is applicable to a case where the multiple access resource is any one of: spatial resources, bit-level interleavers, symbol-level interleavers, power, non-orthogonal codebooks, scrambling codes, mode mapping patterns.

Specifically, consider a method of mapping out multiple access resources from two parameters of a reference signal (that is, taking 2 parameters of the reference signal as indices), namely, a root sequence and a cyclic shift. To obtain a one-to-one mapping from reference signals to resource pools, the resource pools are divided into N_qGroups of N_αA resource to be selected, wherein N_qAnd N_αThe physical meaning of (1) is the same as that of the first embodiment, namely: n is a radical of_qIs the number of root sequences, N_αIs the number of cyclic shifts. It should be noted that: the resource pool can also be divided into N_αGroups of N_qAnd (4) selecting the resource to be selected. In the present embodiment, only the former case is described as an example. First, a group is determined with an index q of a root sequence as a first parameter (corresponding to a first parameter described in claims); the cyclic shift α is then used as a second parameter (corresponding to the second parameter as set forth in the claims) to determine the selected resource. Thus, as described in the first embodiment, the mapping relationship between the reference signal and the selected resource index is:

k＝q+α×N_q

it should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but also can be performed by using q and α in other ways in practical applications. According to the mapping relationship, the grouping rule of the resource pool is as follows: for a multiple access resource k, its corresponding packet index and position in the packet are determined as follows:

grouping and indexing: k mod N_q；

Position in packet:

in order to establish a one-to-one mapping relationship between the 6 codebooks and the reference signal, the SCMA system shown in Table 1 considers the bases shown in Table 2Resource grouping of root sequence index and cyclic shift in reference signal, wherein N is assumed as the number of root sequences_qCyclically shifted by a number N of 2_α3. As shown in table 2, positions 0,1, and 2 in group 0 correspond to codebook numbers 0,2, and 4, respectively, and positions 0,1, and 2 in group 1 correspond to codebook numbers 1,3, and 5, respectively. If the root sequence of the reference signal is 0 and the cyclic shift is 2, the index of the used multiple access resource is 4.

TABLE 1SCMA codebook

Table 2 resource grouping based on root sequence index and cyclic shift of reference signal

In this embodiment, the order of use of the reference signals may be reversed, i.e., cyclic shift is used as the first parameter and the root sequence is used as the second parameter. Meanwhile, the two parameters used may also be other parameters of the reference signal, i.e., COMB and OCC. When the multiple access resources are mapped out by only one parameter of the reference signal, the resources do not need to be grouped, and the index of the parameter is used for determining the multiple access resources.

Example four:

the embodiment considers a hybrid multiple access system, i.e. the multiple access resource is composed of multiple access resource combinations, including at least two cases: spatial resources, bit-level interleavers, symbol-level interleavers, power, non-orthogonal codebooks, scrambling codes, and mode mapping patterns, among others. For such systems, the present embodiment introduces a method for mapping multiple access resources from two parameters of the reference signal, namely the root sequence and the cyclic shift. The specific method is divided into the following three cases:

the first condition is as follows: when the way of combining multiple access resources is complex, the used multiple access resource combination is difficult to generate by one mother resource. At this time, the multiple access resource combinations may be grouped in the manner of the third embodiment, and the corresponding multiple access resource combination may be determined by using the parameter of the reference signal.

Case two: when a bit-level interleaver is included in a multiple access resource combination, such as an IGMA system, a schematic block diagram of a transmitting end is shown in fig. 4. Firstly, data of each user passes through a bit level interleaver distributed by a system, then the bits are modulated into symbols according to a preset modulation mode, and then the generated symbols are mapped to time frequency resources for transmission according to a grid mapping pattern distributed by the system. In this system, the multiple access resource combination includes a first stage (bit-level) interleaver and a trellis mapping pattern (symbol-level interleaver). Wherein the grid mapping pattern may be generated by means of zero padding interleaving. The zero padding interleaver works as follows: assuming that the length of the modulated symbol sequence is L, the total length of the zero-padded sequence is 2L at the end of the sequence by zero padding (the length after zero padding can vary according to the system configuration), and then the sequence is scrambled by a symbol-level interleaver with the length of 2L.

In an IGMA system, a bit-level interleaver and a symbol-level interleaver may be generated separately, i.e., the bit-level interleaver may be generated in a manner as described in the first embodiment using the root sequence index and the cyclic shift of the reference signal. Then, a symbol-level interleaver is generated in the same manner. Specifically, firstly, the interleaver pi is stored at the two ends of the transceiver in advance according to the parent interleaver pi₀(this parent interleaver is different from the parent interleaver that generated the bit-level interleaver), generating a second-level parent interleaver using the root sequence index q; next, an interleaver for symbol interleaving is generated using the cyclic shift α according to the generated second stage mother interleaver. Here, the generation manner of the second stage interleaver and the interleaver for symbol interleaving may be generated in an exponential manner as described in the present embodiment.

In an IGMA system, the bit-level interleaver and the symbol-level interleaver may also be generated using the root sequence index and the cyclic shift of the reference signal, respectively. Specifically, the used bit-level interleaver (according to the rule described in the first embodiment) is generated by using the root sequence index q according to the parent bit-level interleaver pre-stored in the system, and the generated bit-level interleaver index is q. Then, using cyclic shift α of the reference signal, the used symbol level interleaver is generated according to the mother symbol level interleaver pre-stored in the system (according to the rule described in the first embodiment), and the generated symbol level interleaver index is α.

Similarly, for other systems using an interleaver as one of the multiple access resources, such as a multiple access resource combination of an interleaver and a codebook, the interleaver (according to the rule described in the first embodiment) and the other multiple access resources (according to the rule described in the third embodiment) can be generated sequentially by using part or all of the parameters of the reference signal.

Case three: when the combination of multiple access resources includes power, in the same manner as in the second case, the power for multiple access can be generated by using the root sequence and the cyclic shift of the reference signal according to the second embodiment, and then the other multiple access resources can be generated by using the root sequence and the cyclic shift of the reference signal (if the other multiple access resources are interleavers, according to the rule of the first embodiment, if the other multiple access resources are codebooks or complex combinations of multiple access resources, according to the rule of the third embodiment).

In addition, power for multiple access and other multiple access resources may be sequentially generated using a portion of the parameters of the reference signal. For example, the power P ═ P can be generated using the root sequence q of the reference signal₀+qP，P₀For power reference, P is the unit power offset. Then, other multiple access resources are generated using cyclic shifts of the reference signal. If the other multiple access resources are interleaver, they can be generated according to the mother interleaver stored in the system, if they are codebook or complex multiple access resource combination, the resources used can be directly selected by using cyclic shift. The order of use of the reference signal parameters may be reversed here.

In this embodiment, the order of use of the reference signals may be reversed. Meanwhile, the two parameters used may also be other parameters of the reference signal, i.e., COMB and OCC. When mapping out a combination of multiple access resources by only one parameter of the reference signal, for a system comprising an interleaver and/or power in the combination of multiple access resources, the interleaver and power for multiple access is generated by using the parameter in a manner according to the first and/or second embodiment, using the mother interleaver and/or mother power reference stored in the system. For a system with a complex combination of multiple access resources and/or multiple access resources that cannot be generated in a simple manner, such as codebooks, included in the combination of multiple access resources, according to the rules described in the third embodiment, the resources do not need to be grouped, and the multiple access resources used are determined by using the index of the parameter.

Example five:

the existing reference signal generation mode is limited by the time delay expansion of a channel, so that the simultaneous same-frequency access of a large number of users cannot be met. One solution is to boost the capacity of the reference signal by introducing a COMB and/or OCC. As shown in table 3, for different users assigned the same cyclic shift and root sequence, their reference signals can be further distinguished by assigning different COMB and/or OCC. If two different COMB and two different OCC's are introduced, the number of users that the system can access will be 4 times as large as before.

TABLE 3A way to generate reference signals from root sequences, cyclic shifts, OCCs, and COMBs

Here, the root sequence number q and the cyclic shift α of the reference signal are defined as in the first and second embodiments. Further, the OCC index of the reference signal is denoted as n_occ，n_occ＝0，1，…N_occ-1, noting the cyclic shift as n_COMB，n_COMB＝0，1，…，N_COMB-1, wherein N_OCCIs the total number of OCCs, N_COMBIs the total number of COMB. Thus, for a one-to-one mapping, the total number of multiple access resources that can be referred to is N_qN_αN_OCCN_COMB。

For an IDMA system, the main flow of mapping is divided into 4 parts:

step 1, according to a mother interleaver pre-stored in a base station and a terminal, a serial number q of a reference signal root sequence is used as a first parameter (corresponding to the first parameter in the claims), and a second stage mother interleaver is generated according to a certain rule.

And 2, according to the obtained second-stage mother interleaver, taking the cyclic shift alpha of the reference signal as a second parameter (corresponding to the second parameter in the claims), and generating a third-stage mother interleaver according to a certain rule.

Step 3, according to the obtained third-stage mother interleaver, the index n of OCC is used_OCCAs a third parameter (corresponding to the third parameter described in claims), a fourth-stage mother interleaver is generated in accordance with a certain rule.

Step 4, according to the obtained fourth-stage mother interleaver, the index n of COMB is processed_COMBAs a fourth parameter (corresponding to a fourth parameter described in claims), an interleaver to be used is generated in accordance with a certain rule.

FIG. 5 is a mapping flowchart of the interleaver obtaining based on the root sequence, cyclic shift, OCC and COMB of the reference signal in the present application, as shown in FIG. 5, the first and second stage mapping modes are the same as the first embodiment, and for the third stage mapping, the third stage mother interleaver 1+ N is used_qThe resulting fourth level mother interleaver is denoted as fourth level mother interleaver 1+ N_q，1+N_q+N_αN_q，1+N_q+2N_αN_q…，1+N_q+(N_OCC-1)N_αN_q(ii) a Through a fourth stage mother interleaver 1+ N_αN_qThe resulting interleaver is denoted interleaver 1+ N_q+N_αN_q，1+N_q+N_αN_q+N_OCCN_αN_q，…，1+N_q+N_αN_q+(N_COMB-1)N_OCCN_αN_q. The finally obtained interleaver index is denoted as k, k is 0,1, …, N_qN_αN_OCCN_COMB1, the mathematical expression of the above mapping method can be written as:

k＝q+α×N_q+n_OCC×N_qN_α+n_COMB×N_qN_αN_OCC

it should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. Further, when the interleaver is generated in an exponential manner, the interleaver used by terminal k is:

one implementation is as follows:

π_g1＝πg，

this is done:

in which an interleaver pi is generated_gThe selection method is the same as the first embodiment. In addition, the order of use of the four parameters may be interchanged. When the interleaver is generated by using three parameters of the reference signal, the interleaver for multiple access only needs to be obtained through steps 1,2 and 3, and the three parameters used can be any three of the four parameters. When two and one parameters of the reference signal are used to generate the interleaver, the method according to the first embodiment is as described in the first embodiment.

For a system using received power as multiple access resources, such as an uplink power domain NOMA, a specific mapping process is also divided into 4 steps:

step 1, using a power reference predetermined by the system, taking the serial number q of the reference signal root sequence as a first parameter (corresponding to the first parameter in the claims), and generating a second-level power reference according to a certain rule.

And 2, taking the cyclic shift alpha of the reference signal as a second parameter (corresponding to the second parameter in the claims) according to the obtained second-stage power reference, and generating a third-stage power reference according to a certain rule.

Step 3, according to the obtained third-stage power reference, indexing n of OCC_OCCAs a third parameter (corresponding to the third parameter described in the claims), a fourth-stage power reference is generated in accordance with a certain rule.

Step 4, according to the obtained fourth-level power reference, the index n of COMB is used_COMBAs a fourth parameter (corresponding to the fourth parameter in claims), power for multiple access is generated in accordance with a certain rule.

The finally obtained interleaver index is denoted as k, k is 0,1, …, N_qN_αN_OCCN_COMB1, the mathematical expression of the above mapping method can be written as:

k＝q+α×N_q+n_OCC×N_qN_α+n_COMB×N_qN_αN_OCC

the unit power offset is denoted as P, and the pre-determined power reference of the system is P₀Then the received power generated for multiple access is

P_k＝P₀+k×P.

It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. In addition, the order of use of the four parameters may be interchanged. When the three parameters of the reference signal are used for power control, the power for multiple access only needs to be obtained through the steps 1,2 and 3, and the three parameters used can be any three of the four parameters. When two and one parameters of the reference signal are used for power control, the method according to the embodiment two is described.

For systems with codebook and/or pattern mapping as multiple access resources, e.g. SCMA, MUSA, PDMA, NCMA, NOCA andand RSMA, and/or IDMA system where interleaver cannot generate via mother resource, and/or upstream power domain NOMA where power cannot generate via mother resource, namely: for the case where the multiple access resource is any one of: space resource, bit level interleaver, symbol level interleaver, power, non-orthogonal codebook, scrambling code, mode mapping pattern, firstly dividing the multiple access resource into N_qGroups (denoted as first layer groupings) of N per group_αN_OCCN_COMBAnd a resource for selecting a group using an index q of a root sequence generating the reference signal as a first parameter (corresponding to a first parameter in claims). Then, N for each group_αN_OCCN_COMBEach resource is divided into N_αGroups (i.e., second layer groupings), each group containing N_OCCN_COMBAnd a resource for determining a group of the second layer packet using the cyclic shift a for generating the reference signal as a second parameter (corresponding to a second parameter in claims). Then, grouping the second layer into N in each group_OCCN_COMBEach resource is divided into N_OCCGroups (i.e., third layer groupings), each group containing N_COMBResource to generate OCC index n of reference signal_OCCThe group of the third layer packet is determined as a third parameter (corresponding to a third parameter in claims). Finally by generating the COMB index n of the reference signal_COMB(corresponding to the fourth parameter in the claims) the allocated resource is selected in the third layer packet, and the mathematical expression of the index of the resource can be written as:

k＝q+α×N_q+n_OCC×N_qN_α+n_COMB×N_qN_αN_OCC·

wherein k is 0,1, …, N_qN_αN_OCCN_COMB-1. It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. According to the mapping relationship, the grouping rule of the resource pool is as follows: for a multiple access resource k, the packet index of each layer is as follows:

■ first layer packet index: k mod N_q；

■ second layer packet index:

■ layer three packet index:

■ location in layer three packets:

with N_q＝2,N_α＝4，N_OCC＝2，N_COMBFor example, the 32 multiple access resource groups (mapping) are shown in table 4. If the root sequence of the reference signal is 0, the cyclic shift is 1, the OCC index is 0, and the COMB index is 1, the index of the used multiple access resource is 2.

Table 1 resource grouping based on root sequences, cyclic shifts, OCCs, and COMB of reference signals, where the number of root sequences is 2, the number of cyclic shifts is 4, the number of OCCs is 2, and the number of COMB is 2

For a hybrid multiple access system, namely: the multiple access resource is the case of at least two combinations of the following: when the combination of multiple access resources is complex and difficult to generate through mother resources, the grouping mode in the codebook-based multiple access system in the embodiment can be used, so as to complete the mapping of the combination of the reference signal and the multiple access resources.

For the case that the multiple access resource combination includes an interleaver and/or power, all or part of the parameters of the reference signal may be used to sequentially generate the multiple access resources in the multiple access resource combination. For example, an IGMA system, may utilize all four parameters of the reference signal to sequentially generate a bit-level interleaver and a symbol-level interleaver in the manner described in this embodiment. Alternatively, the bit-level interleaver may be generated according to the first embodiment using some parameters of the reference signal, such as the root sequence index and the cyclic shift, and then the symbol-level interleaver may be generated according to the first embodiment using the OCC index of the reference signal. The number of the partial parameters of the reference signal can be one, two or three, and can be any combination of four parameters. Meanwhile, the number and combination of reference signals used by each resource in the generated multiple access resource combination may be different, that is: for an IGMA system, a bit-level interleaver may be generated by a root sequence, cyclic shift, OCC (in the manner of generating an interleaver by three parameters as described in this embodiment), and a symbol level may be generated by COMB and OCC (in the manner of determining multiple access resources by two parameters as described in the first embodiment). Here, in the hybrid multiple access system, when mapping is performed using three parameters of the reference signal, the number of parameters that can be used at most when generating a multiple access resource combination and/or each multiple access resource in the multiple access resource combination is three. In a hybrid multiple access resource system that includes interleavers and/or power, the interleavers and/or power, as well as other multiple access resources (e.g., codebooks), may be mapped using a fractional parameter, i.e., two or one. In this case, the mapping rule according to which the multiple access resource combination includes the interleaver refers to example one, the mapping rule according to which the multiple access resource combination includes power refers to example two, and the mapping rule according to which the other multiple access resource combination includes power refers to example three.

Example six:

the above five embodiments consider a one-to-one mapping scheme of reference signals and multiple access resources. When the channel state is good, the terminal may transmit multiple data streams on the same time-frequency resource, and each data stream selects a different multiple access resource. At this time, the reference signal used by one terminal will correspond to a plurality of multiple access resources. Therefore, in this embodiment, a one-to-many mapping scheme of a reference signal and a multiple access resource is considered. The number of interleavers corresponding to one reference signal is determined by the number of streams transmitted by the terminal.

Considering that the maximum number of data streams that each terminal can transmit on the same time-frequency resource is N_sThe number of data streams actually transmitted by the terminal k is n_k(the number of data streams transmitted by each terminal may be the same or different), the reference signal is determined by four parameters, the first, second, third and fourth parameters are the root sequence, cyclic shift, COMB and OCC, respectively. The mapping method proposed in this embodiment is an extension of the fifth embodiment. For a system using an interleaver as a resource, such as an IDMA, a fifth-stage mother interleaver is first generated by referring to parameters of a signal, i.e., a root sequence, cyclic shift, COMB, and OCC, and an index of the interleaver is denoted by k; then, as shown in fig. 6, the terminal k utilizes the fifth-stage mother interleaver k according to a certain rule and according to the index i of the data stream_k＝0，1，…，n_k-1, an interleaver for generating each data stream, wherein n_kThe total number of data streams transmitted by the terminal on the same time-frequency resource. Thus, the ith of terminal k_kThe mathematical expression of the index of the interleaver used for each data stream is:

k+i_k×N_qN_αN_OCCN_COMB

wherein k is calculated in the same manner as in example five. It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. Further, when the interleaver is generated using an exponential method, the ith of the terminal k_kThe interleaver used for each data stream is:

one implementation is as follows:

π_g1＝π_g，

thus, the device is provided with

In which an interleaver pi is generated_gThe selection method is the same as the first embodiment. It should be noted that the order of use of the four parameters of the reference signal may be interchanged. When the interleaver is generated by using the three parameters of the reference signal, the interleaver used by the terminal only needs to be generated through steps 1,2 and 3 described in the fifth embodiment, and then the interleaver used by each data stream is generated through the index of the data stream. When the interleaver is generated using two or one parameter of the reference signal, the interleaver used by the terminal needs to be generated through the procedure described in the first embodiment, and the interleaver used by each data stream is generated through the index of the data stream. Here, the three, two and one parameters of the reference signal may be any combination of the four available parameters.

For a system using power as a multiple access resource, such as an uplink power domain NOMA, like the fifth embodiment, a fifth-level power reference is first generated through parameters of a reference signal, i.e., a root sequence, cyclic shift, COMB, and OCC, and an index of the power reference is denoted by k; then, the terminal k utilizes the fifth level power reference k according to a certain rule and according to the index i of the data stream_k＝0，1，…，n_k-1, generating a power corresponding to each data stream. Wherein n is_kThe total number of data streams transmitted by the terminal on the same time-frequency resource. Thus, the ith of terminal k_kThe mathematical expression for the index of the power corresponding to each data stream is:

k+i_k×N_qN_αN_OCCN_COMB

wherein k is calculated in the same manner as in the fourth embodiment. The unit power offset is denoted as P, and the pre-determined power reference of the system is P₀Then the received power generated for multiple access is

P_k＝P₀+(k+i_k×N_qN_αN_OCCN_COMB)×P.

It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. In addition, the order of use of the four parameters of the reference signal may be interchanged. When the power control is performed by using the three parameters of the reference signal, only the power for multiple access needs to be generated through steps 1,2 and 3 described in the fifth embodiment, and then the power used by each data stream is generated through the index of the data stream. When power control is performed using two or one parameter of the reference signal, power for multiple access through the procedure described in embodiment two is required, and power used for each data stream is generated by an index of the data stream. Here, the three, two and one parameters of the reference signal may be any combination of the four available parameters.

For systems that map as multiple access resources in codebook and/or mode, such as SCMA, MUSA, PDMA, NCMA, NOCA, and RSMA, and/or IDMA systems that the interleaver cannot produce over the parent resource, and/or uplink power domain NOMA systems that power cannot produce over the parent resource, i.e.: for the case where the multiple access resource is any one of: space resources, a bit-level interleaver, a symbol-level interleaver, power, a non-orthogonal codebook, an orthogonal codebook, scrambling codes, and a mode mapping pattern, and in the fifth embodiment, a multiple access resource is first divided into N_qGroups (denoted as first layer groupings) of N per group_αN_OCCN_COMBN_sAnd resources for selecting a group by generating an index q of a root sequence of the reference signal. Then, N for each group_αN_OCCN_COMBN_sEach resource is divided into N_αGroups (i.e., second layer groupings), each group containing N_OCCN_COMBN_sAnd resources for determining a group of the second layer packet by generating a cyclic shift a of the reference signal. Then, grouping the second layer into N in each group_OCCN_COMBN_sEach resource is divided into N_OCCGroups (i.e., third layer groupings), each group containing N_COMBN_sA resource by generating OCC index n of reference signal_OCCTo determine the group of layer three packets. Next, N of each group in the third layer grouping_COMBN_sEach resource is divided into N_COMBGroups (i.e., fourth layer groupings), each group N_sA resource by generating OCC index n of reference signal_OCCTo determine the group of layer three packets. Wherein N is_sThe maximum number of data streams that can be transmitted on the same time-frequency resource for each terminal. Data stream index i of the last transmission by the terminal_k＝0，1，2，…，n_k-1 selecting allocated resources in a fourth layer packet, where n_kTotal number of data streams transmitted on the same time-frequency resource for a terminal and n_k≤N_s. Thus, the resource index j is 0,1,2, …, N_qN_αN_OCCN_COMBN_sThe mathematical expression of the mapping rule with reference signal and transport stream indices can be written as:

j＝k+i_k×N_qN_αN_OCCN_COMB，

wherein k is q + α × N_q+n_OCC×N_qN_α+n_COMB×N_qN_αN_OCCThe same as the third embodiment. It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. According to the mapping relationship, the grouping rule of the resource pool is as follows: for the multiple access resource j, the corresponding grouping index of each layer is as follows:

■ first layer packet index: j mod N_q；

■ second layer packet index:

■ layer three packet index:

■ layer four packet index:

■ position in layer four packet:

with N_q＝2,N_α＝2，N_OCC＝2，N_COMB2 and N_sFor example, the 32 multiple access resource groups (mapping) are shown in table 5. If the root sequence of the reference signal is 0, the cyclic shift is 1, the OCC index is 0, and the COMB index is 1, the index of the multiple access resource used by the first transmission stream is 10, and the index of the multiple access resource used by the second transmission stream is 26.

Table 2 resource grouping of root sequences, cyclic shifts, OCCs, COMB, and data streams based on the reference signal, where the number of root sequences is 2, the number of cyclic shifts is 2, the number of OCCs is 2, the number of COMB is 2, and the maximum number of data streams is 2

In addition, the order of use of the four parameters of the reference signal may be interchanged. When the multiple access resource is selected by using the three parameters of the reference signal, only three layers of grouping are needed, and then the multiple access resource used in the third layer of grouping is selected by the index of the data stream. When selecting multiple access resources using two or one parameter of the reference signal, two or one layer grouping is required, and then the multiple access resources used in the last layer grouping are selected by the index of the data stream. Here, the three, two and one parameters of the reference signal may be any combination of the four available parameters.

For a hybrid multiple access system, namely: for the case where the multiple access resource is a combination of at least two of: the method comprises the following steps of space resource, bit-level interleaver, symbol-level interleaver, power, non-orthogonal codebook, scrambling code and mode mapping pattern, when the multi-address resource combination is complex and is difficult to generate through mother resources, the grouping mode can be continued, and thus the mapping of the reference signal and data stream index and the multi-address resource combination is completed. For the case where the multiple access resource combination includes an interleaver and/or power, such as IGMA, the data stream index may be combined with the parameters for generating the interleaver, or with the parameters for generating the power, or with the parameters for generating other multiple access resources, and then the multiple access resource combination used by each data stream for each user may be determined in the manner described in this embodiment.

It should be noted here that since the resources used by the data streams of different terminals are generated by different mother interleavers or different power references or do not belong to the same packet, resource collision does not occur between multiple streams of different terminals. In addition, when the number of data streams transmitted by each terminal is different, the corresponding multiple access resource can be dynamically generated by a fifth-stage mother interleaver (for IDMA and IGMA systems), or generated by a fifth power reference (for uplink power domain NOMA) or selected from a fourth-layer packet (for SCMA, MUSA, PDMA, NCMA, NOCA, RSMA, and hybrid multiple access system). For example, in table 5, if terminal 0 transmits only one data stream, only multiple access resource 0 needs to be selected. When there is only one data stream per terminal, i.e. n₁＝n₂…, for IDMA and IGMA systems, the fifth-stage interleaver generated by the mapping method of this embodiment is the interleaver used by terminal k; for the uplink power domain NOMA, the fifth-level power reference generated by the mapping manner of this embodiment is the power used by the terminal k; for SCMA, RSMA, PDMA, MUSA, NCMA, NOCA systemsAnd a system using multiple access resource combination as multiple access resources, where the 0 th resource in the fourth layer packet generated by the mapping method in this embodiment is a resource used by the terminal k.

Example seven:

the above six embodiments discuss the case of one-to-one and one-to-many mapping of reference signals and multiple access resources, respectively. In this embodiment, for any multiple access resource manner described in the third embodiment and the hybrid multiple access system described in the fourth embodiment, a case where the size of the resource pool is smaller than the number of available reference signals is considered. At this time, even if the two terminals use the same resource, the base station can perform channel estimation and further detect data of the two terminals as long as the reference signals used by the two terminals are different, and the purpose of distinguishing the terminals can still be achieved by embedding the terminal ID into the data. Therefore, in the present embodiment, a many-to-one mapping relationship between the reference signal and the multiple access resource is introduced.

Here, considering that the reference signal is determined by four parameters, i.e. the root sequence, the cyclic shift, the COMB and the OCC, the total number of users that can be accessed on the same time-frequency resource in the system, i.e. the total number of reference signals is N-N_qN_αN_OCCN_COMB. In addition, the size of the resource pool (number of available codebooks) is K, where K < N. In this embodiment, the selectable resources in the resource pool are grouped into three layers. The first, second, third layer packets and the location of the resource in the third layer packet are referred to by the first, second, third, fourth parameters of the reference signal, respectively. Here, since the number of resources is less than the number of available reference signals, there may be overlap in grouping, i.e., the same resource may belong to multiple groups or have the same resource in a group, thereby completing the many-to-one mapping of reference signals to resources.

Specifically, in this embodiment, the first, second, third, and fourth parameters are respectively the root sequence q, the cyclic shift α, and the COMB index n_COMBAnd OCC index n_OCCThe description is given for the sake of example. The mapping relationship described in this embodiment can be described as follows: for root sequence q, cyclic shift α, COMB index n_COMBAnd OCC index n_OCCPair of itThe corresponding multiple access resource index (i.e., codebook) is:

k＝(q+α×N_q+n_OCC×N_qN_α+n_COMB×N_qN_αN_OCC)mod K

it should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. According to the mapping rule, the number of multiple access resources equal to the total number of reference signals is obtained by copying. Specifically, the multiple access resource K ' is 0,1,2, …, N-1, which is obtained by replication of the multiple access resource K ' 0,1,2, …, K-1, where K ' is K + pK and p is a natural number. Then, the grouping rules of the resource pools are as follows: for the multiple access resource k' 0,1, …, N-1, the corresponding grouped index of each layer is:

■ first layer packet index: k' mod N_q；

■ second layer packet index:

■ layer three packet index:

■ location in layer three packets:

it can be seen that the multiple access resource k corresponds to

A different reference signal. In the example shown in Table 6, N_q＝2,N_α＝4，N_OCC＝2，N_COMB2 and K16, then each resource corresponds to two different reference signals. If the reference signals of two terminals have the same root sequence, cyclic shift and OCC, but the COMB of the two terminals are different, then they use the sameThe multiple access resource of (2).

Table 3 resource grouping of root sequences, cyclic shifts, OCCs, COMB, and data streams based on reference signals, where the number of root sequences is 2, the number of cyclic shifts is 4, the number of OCCs is 2, the number of COMB is 2, the size of resource pool is 16

It should be noted that, when the size of the resource pool is equal to the number of available reference signals, that is, K is equal to N, the mapping manner described in this embodiment is changed to one-to-one mapping, that is, as described in embodiment four. In addition, when the reference signal is determined by two parameters (i.e., first and second parameters) or by three parameters (i.e., first, second, and third parameters), only one-layer and two-layer grouping is required.

Example eight:

in the seventh embodiment, the mapping rule when the total number of multiple access resources is less than the number of terminals accessed on the same time-frequency resource (i.e. the total number of reference signals) in the system using codebook as multiple access resource is considered. In this embodiment, the case when each terminal has multiple access streams and the total number of multiple access resources is smaller than the total number of data streams accessed on the same time-frequency resource is further discussed. In particular, the total number of multiple access resources is denoted as K, and the number of terminals accessed in the system is equal to the total number of reference signals N ═ N_qN_αN_OCCN_COMB. The maximum number of data streams that each terminal can transmit on the same time-frequency resource is denoted as N_s. In example four, consider K ═ N × N_sExample five considers the case where K < N and N _s1. In this embodiment, consider K < NxN_sAnd N is_s＞1。

In this embodiment, the multiple access resources in the resource pool are grouped into four layers. The first, second, third, and fourth layer packets and the location of the resource in the fourth layer packet are referred to by the first, second, third, and fourth parameters of the reference signal and the index of the data stream, respectively. Here, since the number of resources is less than the number of available reference signals, there may be overlap in grouping, i.e., the same resource may belong to multiple groups or have the same resource in a group, thereby completing the many-to-one mapping of reference signals to resources.

Taking the first, second, third, and fourth parameters of the reference signal as the root sequence, cyclic shift, OCC, and COMB, respectively, as an example, the mapping relationship in this embodiment may be described as follows: for root sequence q, cyclic shift α, COMB index n_COMBAnd OCC index n_OCCAnd index i of the data stream_kThe corresponding multiple access resource index is:

k＝q+α×N_q+n_OCC×N_qN_α+n_COMB×N_qN_αN_OCC+i_k×N_qN_αN_OCCN_COMB mod K

wherein i_k＝0，1，2，…，n_k-1 and n_k≤N_sThe number of transmission streams of the terminal k in the same time-frequency resource is shown. It should be noted that: the mathematical expression of the mapping rule is merely an example, and the mapping is not only performed according to the mathematical expression, but in practical applications, the mapping can also be performed by using the above parameters in other manners. The grouping rule is obtained according to the mapping rule as follows: the number of multiple access resources equal to the total number of reference signals is obtained by means of replication. Multiple access resource k' 0,1,2, …, NN_s-1, duplicated from multiple access resource K ═ 0,1,2, …, K-1, where K' ═ K + pK, and p is a natural number. Then, grouping the copied resource pools according to the following rules: NN for multiple access resources k' ═ 0,1, …_s-1The corresponding grouping index of each layer is as follows:

first layer packet index: k' mod N_q；

Fourth layer packet index:

position in layer four packet:

it should be noted that, as described in the sixth embodiment, when the reference signal is determined by two parameters (i.e., the first and second parameters) or by three parameters (i.e., the first, second, and third parameters), only two-layer and three-layer grouping is required.

Example nine:

in the above eight embodiments, how the reference signals allocated by the base station are mapped to the corresponding multiple access resources in the scheduling-based system is considered. In this embodiment, the application of the mapping scheme described in this application to a dispatch-free system is discussed. As shown in fig. 2, this embodiment specifically describes mapping from a preamble sequence to a reference signal, and the mapping schemes from the reference signal to multiple access resources are as described in embodiments one to eight.

The leader sequences are grouped by the following rules: taking M as the total number of leader sequences, for leader sequences M-0, 1, …, M-1, the grouping is:

first layer packet index: m mod Nq'

Second layer packet index:

layer three packet index:

position in layer three packet:

thus, the root sequence index of the reference signal is determined by the first layer packet index to which the selected preamble sequence belongsq (corresponding to the eighth parameter in the claims), then determining the cyclic shift a of the reference signal using the index of the second layer packet to which the selected preamble sequence belongs (corresponding to the seventh parameter in the claims), and then determining the index n of the OCC of the reference signal using the index of the third layer packet to which the selected preamble sequence belongs_OCC(sixth parameter in the claim) and finally determining the index n of the COMB of the reference signal according to the position of the selected preamble sequence in the third layer packet_COMB(corresponding to the fifth parameter in the claims). This embodiment describes a case where four parameters of the reference signal need to be determined, and the determination order of the four parameters may be reversed. In addition, the mapping rule described in this embodiment is also applicable to the case where three and two parameters of the reference signal need to be determined. Two-layer and one-layer grouping of the preamble sequence is required. For the case where one parameter of the reference signal needs to be determined, it can be directly calculated by the sequence number of the preamble sequence. The three, two, and one parameters of the designed reference signal may be any combination of root sequence, cyclic shift, OCC, and COMB.

It should be noted that the total number M of preamble sequences is smaller than and/or equal to the total number N of available reference signals_qN_αN_OCCN_COMBWhen M ≦ N, the mapping rule causes any preamble sequence to map to a unique reference signal. When the total number of preamble sequences is larger than the total number of available reference signals, i.e., M > N, the mapping rule is such that a plurality of preamble sequences are mapped to one reference signal. Specifically, for leader sequence with sequence number m '+ p.N, m' is less than or equal to N-1,

m '+ pN.ltoreq.M-1, all mapped to the same reference signal as the leader sequence M'. For example, when N is_q＝2,N_α＝4，N_OCC＝2，N_COMB2 and M64, the preamble sequence with index 0 and the preamble sequence with index 32 map to the same reference signal, i.e. q is 0, α is 0, n_OCC＝0，n_COMB＝0。

Corresponding to the above method, the present application further provides a mapping apparatus for a reference signal and multiple access resources, as shown in fig. 7, the apparatus includes:

a reference signal determining module, configured to determine a reference signal used for uplink data transmission;

the mapping module is used for determining the multiple access resources according to the mapping relation between the reference signals and the multiple access resources;

a transmission module, configured to perform communication using the multiple access resource.

Preferably, the reference signal determining module is further configured to determine, according to the selected preamble sequence, a reference signal used for uplink data transmission according to a set rule.

In the new multiple access technology, the base station needs to inform the terminal which resource to use for communication through additional signaling overhead. In the invention, a method for determining the mapping relation between the reference signal and the resource pool is provided, so that the base station and the terminal can obtain the corresponding multiple access resource information through the allocated reference signal, thereby avoiding the additional signaling overhead and the transmission delay. The mapping method of the present invention can dynamically obtain corresponding multiple access resources (which can be one-to-one, one-to-many, or many-to-one mapping) according to the generation method of the reference signal and the application scenario. The invention can be applied to a scheduling-free system to simplify the process and reduce the complexity.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (28)

1. A method for mapping a reference signal and a multiple access resource, comprising:

determining a reference signal used for uplink data transmission;

determining multiple access resources according to the mapping relation between the reference signals and the multiple access resources;

and carrying out data transmission by using the multiple access resources.

2. The method of claim 1, wherein:

the determining the multiple access resource according to the mapping relationship between the reference signal and the multiple access resource includes: and determining corresponding multiple access resources according to a set mapping rule by taking the parameter for generating the reference signal as an index.

3. The method of claim 2, wherein:

if the multiple access resource is an interleaver, when T1 parameters among the parameters are used as indexes, where T1 is greater than or equal to 1 and less than or equal to 4, and the determining the corresponding multiple access resource according to the set mapping rule includes:

and generating a next-stage mother interleaver by using a prestored mother interleaver as a first-stage mother interleaver and using any unused parameter of the T1 parameters as an index according to a set rule, and so on until the last unused parameter of the T1 parameters is used as an index to generate an interleaver for multiple access.

4. The method of claim 2, wherein:

if the multiple access resource is power, when T2 parameters of the parameters are used as indexes, where T2 is greater than or equal to 1 and less than or equal to 4, and determining the corresponding multiple access resource according to the set mapping rule includes:

and taking a pre-agreed power reference as a first-stage power reference, generating a next-stage power reference by using any unused parameter of the T2 parameters as an index according to a set rule, and repeating the steps until the last unused parameter of the T2 parameters is used as an index to generate power for multiple access.

5. The method of claim 2, wherein:

when the multiple access resource is any one of or a combination of at least two of the following: spatial resources, bit-level interleavers, symbol-level interleavers, power, non-orthogonal codebooks, scrambling codes, mode mapping patterns,

if 1 parameter of the reference signal is used as an index, the parameter for generating the reference signal is used as an index, and the determining of the corresponding multiple access resource according to the set mapping rule comprises the following steps: selecting corresponding multiple access resources according to the parameters;

if 2 parameters of the reference signal are used as indexes, the method further comprises: dividing the multiple access resources into N₁Groups of N₂A resource; wherein N is₁And N₂The number of the first parameter and the number of the second parameter in the 2 parameters are respectively; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of multiple access resources according to the first parameter, and selecting the multiple access resources used in the selected group according to the second parameter; and/or

If 3 parameters of the reference signal are used as indexes, the method further comprises: grouping the multiple access resources into N layers₁Groups of N₂*N₃A resource; grouping the first layer into N groups₂*N₃A resource is grouped into a second layer of N₂Groups, each group comprising N₃A resource; wherein N is₁、N₂And N₃The number of the first parameter, the second parameter and the third parameter in the 3 parameters are respectively; the mapping out the corresponding multiple access resource according to the set mapping rule by taking the parameter for generating the reference signal as an index comprises: selecting a group of the multiple access resources grouped in a first layer according to a first parameter, selecting a group of the multiple access resources grouped in a second layer according to a second parameter, and selecting the used multiple access resources in a selected group of a fourth layer according to a third parameter; and/or

If 4 parameters of the reference signal are used as indexes, the method further comprises: grouping the multiple access resources into a first layerTo N₁Groups of N₂*N₃*N₄A resource; grouping the first layer into N groups₂*N₃*N₄A resource is grouped into a second layer of N₂Groups, each group comprising N₃*N₄A resource; grouping the second layers into N of each group₃*N₄The resources are grouped into a third layer of N₃Groups, each group comprising N₄A resource; wherein N is₁、N₂、N₃And N₄The number of the first parameter, the second parameter, the third parameter and the fourth parameter in the 4 parameters are respectively; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of the multiple access resources grouped in the first layer according to the first parameter, selecting a group of the multiple access resources grouped in the second layer according to the second parameter, selecting a group of the multiple access resources grouped in the third layer according to the third parameter, and selecting the used multiple access resources in the selected group of the third layer according to the fourth parameter.

6. The method of claim 3, wherein:

when a terminal transmits at least two data streams on the same time-frequency resource, determining the corresponding multiple access resource according to the set mapping rule by using the parameter for generating the reference signal as an index further comprises: and taking the interleaver for multiple access as a last-stage mother interleaver, and generating the interleaver used by each data stream according to the index of the data stream according to a set rule based on the last-stage mother interleaver.

7. The method of claim 4, wherein:

when a terminal transmits at least two data streams on the same time-frequency resource, determining the corresponding multiple access resource according to the set mapping rule by using the parameter for generating the reference signal as an index further comprises: and taking the power for multiple access as the last-stage power reference, and generating the power used by each data stream according to the index of the data stream according to a set rule based on the last-stage power reference.

8. The method of claim 5, wherein:

for the case of using 1 parameter of the reference signal as an index, when one terminal transmits at least two data streams on the same time-frequency resource, the method further includes: dividing the multiple access resources into N₁Groups, each group comprising N_sA resource; wherein N is₁Is the number of the 1 parameter, N_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of multiple access resources in the first layer grouping according to the first parameter, and selecting the multiple access resources used by each data stream in the selected second layer grouping group according to the index of the data stream; and/or

For the case of using 2 parameters of the reference signal as an index, when one terminal transmits at least two data streams on the same time-frequency resource, the method further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N_sA resource; n of each group₂*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N_sA resource; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of the multiple access resources grouped in a first layer according to a first parameter, selecting a group of the multiple access resources grouped in a second layer according to a second parameter, and selecting the multiple access resources used by each data stream in the selected group of the second layer according to the index of the data stream; and/or

For 3 parameters using the reference signalFor the case of indexing, when a terminal transmits at least two data streams on the same time-frequency resource, the method further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N₃*N_sA resource; grouping the first layer into N groups₂*N₃*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N₃*N_sA resource; grouping the second layers into N of each group₃*N_sThe resources are grouped into a third layer of N₃Groups, each group comprising N_sA resource; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting a group of multiple access resources grouped in a first layer according to a first parameter, selecting a group of multiple access resources grouped in a second layer according to a second parameter, selecting a group of multiple access resources grouped in a third layer according to a third parameter, and selecting the multiple access resources used by each data stream in the selected group of the third layer according to the index of the data stream; and/or

For the case of using 4 parameters of the reference signal as an index, when one terminal transmits at least two data streams on the same time-frequency resource, the method further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N₃*N₄*N_sA resource; grouping the first layer into N groups₂*N₃*N₄*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N₃*N₄*N_sA resource; grouping the second layers into N of each group₃*N₄*N_sThe resources are grouped into a third layer of N₃Groups, each group comprising N₄*N_sA resource; grouping the third layer into N of each group₄*N_sThe resource is grouped into N₄Groups, each group comprising N_sA resource; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the determining, by using the parameter for generating the reference signal as an index, the corresponding multiple access resource according to the set mapping rule includes: selecting the grouping of the multiple access resources in the first layer according to the first parameter, selecting the grouping of the multiple access resources in the second layer according to the second parameter, selecting the grouping of the multiple access resources in the third layer according to the third parameter, selecting the grouping of the multiple access resources in the fourth layer according to the fourth parameter, and selecting the multiple access resources used by each data stream in the selected grouping group of the fourth layer according to the index of the data stream.

9. The method according to any one of claims 3 to 8, wherein:

when the multiple access resource is a combination of a bit-level interleaver and at least one of: the method comprises the following steps of determining corresponding multiple access resources according to a set mapping rule by using parameters for generating the reference signal as indexes, wherein the parameters comprise the following steps:

and respectively determining corresponding interleavers for multiple access and other multiple access resources according to a set mapping rule by taking all or part of parameters for generating the reference signals as indexes.

10. The method according to any one of claims 3 to 8, wherein:

when the multiple access resource is a combination of power and at least one of: the method comprises the following steps of determining corresponding multiple access resources according to a set mapping rule by using parameters for generating the reference signal as indexes, wherein the parameters comprise:

and respectively determining corresponding power for multiple access and other multiple access resources according to a set mapping rule by taking all or part of parameters for generating the reference signals as indexes.

11. The method of claim 5, wherein:

when the total number of multiple access resources is less than the total number of reference signals, the method further comprises: and the total number of the multiple access resources is equal to the total number of the reference signals in a copying mode, and the copied multiple access resources are subjected to corresponding grouping operation.

12. The method of claim 8, wherein:

when the total number of multiple access resources is less than the product of the total number of reference signals and the maximum number of transmission streams of the terminal, the method further comprises: and performing corresponding grouping operation on the copied multiple access resources by making the total number of the multiple access resources equal to the product of the total number of the reference signals and the maximum transmission stream number of the terminal in a copying mode.

13. The method according to any one of claims 1 to 12, wherein:

in a schedule-free system, the method further comprises: and determining the parameters according to the selected leader sequence and the set rule by the mapping relation of the leader sequence and the parameters for generating the reference signals used by the uplink data transmission, wherein the number of the parameters is 1-4.

14. The method of claim 13, wherein:

the parameters used by the preamble sequence and for generating the reference signal for uplink data transmission include:

if the number of the parameters is 1, determining the parameters by using the leader sequence;

if the number of the parameters is 2, the leader sequence is grouped into N layers₁₁Group (d); determining a sixth parameter of the 2 parameters by using the position of the selected preamble sequence in the first layer packet, and determining a fifth parameter of the 2 parameters by using the first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁The number of the fifth parameters; and/or

If the number of the parameters is 3, the leader sequence is grouped into N layers₁₁Group (d); performing second layer grouping on the leader sequence in each group of the first layer grouping into N₂₁Group (d); determining a seventh parameter of the 3 parameters using a position of the selected preamble sequence in the second layer packet, determining a sixth parameter of the 3 parameters using a second layer packet group to which the selected preamble sequence belongs, and determining a fifth parameter of the 3 parameters using a first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁Is the number of the fifth parameter, N₂₁The number of the sixth parameters; and/or

If the number of the parameters is 4, the leader sequence is grouped into N layers₁₁Group (d); performing second layer grouping on the leader sequence in each group of the first layer grouping into N₂₁Group (d); performing third layer grouping on the leader sequence in each group of the second layer grouping into N₃₁Group (d); determining an eighth parameter of the 4 parameters using a position of the selected preamble sequence in the third layer packet, determining a seventh parameter of the 4 parameters using a third layer packet group to which the selected preamble sequence belongs, determining a sixth parameter of the 4 parameters using a second layer packet group to which the selected preamble sequence belongs, and determining a fifth parameter of the 4 parameters using a first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁Is the number of the fifth parameter, N₂₁The number of the sixth parameters; n is a radical of₃₁Is the number of the seventh parameter.

15. An apparatus for mapping a reference signal to a multiple access resource, comprising:

a reference signal determining module, configured to determine a reference signal used for uplink data transmission;

the mapping module is used for determining the multiple access resources according to the mapping relation between the reference signals and the multiple access resources;

and the transmission module is used for transmitting data by using the multiple access resources.

16. The apparatus of claim 15, wherein:

the reference signal determining module is further configured to determine, according to the selected preamble sequence, a reference signal used for uplink data transmission according to a set rule;

the mapping module takes the parameter for generating the reference signal as an index, and determines the corresponding multiple access resource according to a set mapping rule.

17. The apparatus of claim 16, wherein:

if the multiple access resource is an interleaver, when T1 parameters of the parameters are used as indexes, wherein T1 is more than or equal to 1 and less than or equal to 4, the mapping module comprises:

and generating a next-stage mother interleaver by using a prestored mother interleaver as a first-stage mother interleaver and using any unused parameter of the T1 parameters as an index according to a set rule, and so on until the last unused parameter of the T1 parameters is used as an index to generate an interleaver for multiple access.

18. The apparatus of claim 16, wherein:

if the multiple access resource is power, when T2 parameters are used as indexes, where T2 is greater than or equal to 1 and less than or equal to 4, the mapping module includes:

and taking a pre-agreed power reference as a first-stage power reference, generating a next-stage power reference by using any unused parameter of the T2 parameters as an index according to a set rule, and repeating the steps until the last unused parameter of the T2 parameters is used as an index to generate power for multiple access.

19. The apparatus of claim 16, wherein:

when the multiple access resource is any one of or a combination of at least two of the following: spatial resources, bit-level interleavers, symbol-level interleavers, power, non-orthogonal codebooks, scrambling codes, mode mapping patterns,

if 1 parameter of the reference signal is used as an index, the mapping module comprises: selecting corresponding multiple access resources according to the parameters;

if 2 parameters of the reference signal are used as indexes, the mapping device further comprises: dividing the multiple access resources into N₁Groups of N₂A module of resources; wherein N is₁And N₂The number of the first parameter and the number of the second parameter in the 2 parameters are respectively; the mapping module includes: selecting a group of multiple access resources according to the first parameter, and selecting the multiple access resources used in the selected group according to the second parameter; and/or

If the 3 parameters of the reference signal are used as indexes, the mapping device further comprises: grouping the multiple access resources into N layers₁Groups of N₂*N₃A module of resources; grouping the first layer into N groups₂*N₃A resource is grouped into a second layer of N₂Groups, each group comprising N₃A module of resources; wherein N is₁、N₂And N₃The number of the first parameter, the second parameter and the third parameter in the 3 parameters are respectively; the mapping module includes: selecting a group of the multiple access resources grouped in a first layer according to a first parameter, selecting a group of the multiple access resources grouped in a second layer according to a second parameter, and selecting the used multiple access resources in a selected group of a fourth layer according to a third parameter; and/or

If the 4 parameters of the reference signal are used as indexes, the mapping device further comprises: grouping the multiple access resources into N layers₁Groups of N₂*N₃*N₄A module of resources; grouping the first layer into N groups₂*N₃*N₄A resource is grouped into a second layer of N₂Groups, each group comprising N₃*N₄A module of resources; grouping the second layers into N of each group₃*N₄The resources are grouped into a third layer of N₃Groups, each group comprising N₄A module of resources; wherein N is₁、N₂、N₃And N₄The number of the first parameter, the second parameter, the third parameter and the fourth parameter in the 4 parameters are respectively; the mapping module includes: selecting a group of the multiple access resources grouped in the first layer according to the first parameter, selecting a group of the multiple access resources grouped in the second layer according to the second parameter, selecting a group of the multiple access resources grouped in the third layer according to the third parameter, and selecting the used multiple access resources in the selected group of the third layer according to the fourth parameter.

20. The apparatus of claim 17, wherein:

when a terminal transmits at least two data streams on the same time-frequency resource, the mapping module further comprises: and taking the interleaver for multiple access as a last-stage mother interleaver, and generating the interleaver used by each data stream according to the index of the data stream according to a set rule based on the last-stage mother interleaver.

21. The apparatus of claim 18, wherein:

when a terminal transmits at least two data streams on the same time-frequency resource, the mapping module further comprises: and taking the power for multiple access as the last-stage power reference, and generating the power used by each data stream according to the index of the data stream according to a set rule based on the last-stage power reference.

22. The apparatus of claim 19, wherein:

for the case of using 1 parameter of the reference signal as an index, when a terminal transmits at least two data streams on the same time-frequency resource, the mapping device further includes: will be describedSaid division of multiple access resources into N₁Groups, each group comprising N_sA module of resources; wherein N is₁Is the number of the 1 parameter, N_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the mapping module includes: selecting a group of multiple access resources in the first layer grouping according to the first parameter, and selecting the multiple access resources used by each data stream in the selected second layer grouping group according to the index of the data stream; and/or

For the case of using 2 parameters of the reference signal as an index, when a terminal transmits at least two data streams on the same time-frequency resource, the mapping device further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N_sA module of resources; n of each group₂*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N_sA module of resources; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the mapping module includes: selecting a group of the multiple access resources grouped in a first layer according to a first parameter, selecting a group of the multiple access resources grouped in a second layer according to a second parameter, and selecting the multiple access resources used by each data stream in the selected group of the second layer according to the index of the data stream; and/or

For the case of using 3 parameters of the reference signal as an index, when a terminal transmits at least two data streams on the same time-frequency resource, the mapping device further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N₃*N_sA module of resources; grouping the first layer into N groups₂*N₃*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N₃*N_sA module of resources; grouping the second layers into N of each group₃*N_sThe resources are grouped into a third layer of N₃Groups, each group comprising N_sA module of resources; wherein N is_sFor each terminalThe maximum data flow number which can be transmitted by the terminal on the same time-frequency resource; the mapping module includes: selecting a group of multiple access resources grouped in a first layer according to a first parameter, selecting a group of multiple access resources grouped in a second layer according to a second parameter, selecting a group of multiple access resources grouped in a third layer according to a third parameter, and selecting the multiple access resources used by each data stream in the selected group of the third layer according to the index of the data stream; and/or

For the case of using 4 parameters of the reference signal as an index, when a terminal transmits at least two data streams on the same time-frequency resource, the mapping device further includes: grouping the multiple access resources into N layers₁Groups, each group comprising N₂*N₃*N₄*N_sA module of resources; grouping the first layer into N groups₂*N₃*N₄*N_sA resource is grouped into a second layer of N₂Groups, each group comprising N₃*N₄*N_sA module of resources; grouping the second layers into N of each group₃*N₄*N_sThe resources are grouped into a third layer of N₃Groups, each group comprising N₄*N_sA module of resources; grouping the third layer into N of each group₄*N_sThe resource is grouped into N₄Groups, each group comprising N_sA module of resources; wherein N is_sThe maximum data flow number which can be transmitted on the same time-frequency resource is set for each terminal; the mapping module includes: selecting the grouping of the multiple access resources in the first layer according to the first parameter, selecting the grouping of the multiple access resources in the second layer according to the second parameter, selecting the grouping of the multiple access resources in the third layer according to the third parameter, selecting the grouping of the multiple access resources in the fourth layer according to the fourth parameter, and selecting the multiple access resources used by each data stream in the selected grouping group of the fourth layer according to the index of the data stream.

23. The apparatus according to any one of claims 17 to 22, wherein:

when the multiple access resource is a combination of a bit-level interleaver and at least one of: spatial resources, power, symbol level interleaver, non-orthogonal codebook, scrambling code, mode mapping pattern, the mapping module comprising:

and respectively determining corresponding interleavers for multiple access and other multiple access resources according to a set mapping rule by taking all or part of parameters for generating the reference signals as indexes.

24. The apparatus according to any one of claims 17 to 22, wherein:

when the multiple access resource is a combination of power and at least one of: spatial resources, a bit-level interleaver, a symbol-level interleaver, a non-orthogonal codebook, an orthogonal codebook, scrambling codes, a mode mapping pattern, the mapping module comprising:

and respectively determining corresponding power for multiple access and other multiple access resources according to a set mapping rule by taking all or part of parameters for generating the reference signals as indexes.

25. The apparatus of claim 19, wherein:

when the total number of multiple access resources is less than the total number of reference signals, the mapping apparatus further includes: and a module for making the total number of the multiple access resources equal to the total number of the reference signals by a copying mode and carrying out corresponding grouping operation on the copied multiple access resources.

26. The apparatus of claim 22, wherein:

when the total number of the multiple access resources is less than the product of the total number of the reference signals and the maximum number of transmission streams of the terminal, the mapping apparatus further includes: and a module for performing corresponding grouping operation on the copied multiple access resources by making the total number of the multiple access resources equal to the product of the total number of the reference signals and the maximum transmission stream number of the terminal in a copying manner.

27. The apparatus according to any one of claims 15 to 26, wherein:

in a schedule-free system, the mapping device further comprises: and determining the parameter module according to the selected leader sequence and the set rule by the mapping relation of the leader sequence and the parameter used for generating the reference signal used by the uplink data transmission, wherein the number of the parameters is 1-4.

28. The apparatus of claim 27, wherein:

the parameters used by the preamble sequence and for generating the reference signal for uplink data transmission include:

if the number of the parameters is 1, determining the parameters by using the leader sequence;

if the number of the parameters is 2, the leader sequence is grouped into N layers₁₁Group (d); determining a sixth parameter of the 2 parameters by using the position of the selected preamble sequence in the first layer packet, and determining a fifth parameter of the 2 parameters by using the first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁The number of the fifth parameters; and/or

If the number of the parameters is 3, the leader sequence is grouped into N layers₁₁Group (d); performing second layer grouping on the leader sequence in each group of the first layer grouping into N₂₁Group (d); determining a seventh parameter of the 3 parameters using a position of the selected preamble sequence in the second layer packet, determining a sixth parameter of the 3 parameters using a second layer packet group to which the selected preamble sequence belongs, and determining a fifth parameter of the 3 parameters using a first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁Is the number of the fifth parameter, N₂₁The number of the sixth parameters; and/or

If the number of the parameters is 4, the leader sequence is grouped into N layers₁₁Group (d); performing second layer grouping on the leader sequence in each group of the first layer grouping into N₂₁Group (d); grouping the second layer into leader sequences in each groupIn a third layer of packets, divided into N₃₁Group (d); determining an eighth parameter of the 4 parameters using a position of the selected preamble sequence in the third layer packet, determining a seventh parameter of the 4 parameters using a third layer packet group to which the selected preamble sequence belongs, determining a sixth parameter of the 4 parameters using a second layer packet group to which the selected preamble sequence belongs, and determining a fifth parameter of the 4 parameters using a first layer packet group to which the selected preamble sequence belongs; wherein N is₁₁Is the number of the fifth parameter, N₂₁The number of the sixth parameters; n is a radical of₃₁Is the number of the seventh parameter.

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