A data transmission method and device
A technology of data transmission and data flow, applied in the field of communication, can solve the problem of high overhead of network interaction information
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Embodiment 1
[0101] Multiple access refers to a way to realize simultaneous access of multiple users within a specified wireless resource. Common multiple access methods include time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), code division multiple access (Code Division Multiple Access, CDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) and other methods.
[0102] Sparse Code Multiple Access (SCMA) uses low-density sparse codes to expand in a specific time-frequency domain, and realizes simultaneous access of a large number of users in a non-orthogonal manner, enabling access users The number of is greater than the number of orthogonal resource blocks, thereby improving the utilization of resource blocks.
[0103]Base station coordinated transmission means that multiple base stations geographically separated cooperate to participate in data transmission for a terminal or jointl...
Embodiment 2
[0136] In the SCMA communication system, this embodiment provides a data transmission method, such as figure 2 As shown, the specific process is as follows:
[0137] 201: The controller determines a collaboration set.
[0138] A cooperating set is a collection of base stations that provide data transmission to the same terminal, and can be combined using dynamic, semi-dynamic or static methods. Known technical means can be used to combine the cooperating set, which will not be repeated here.
[0139] 202: The controller sends a codebook instruction to each base station in the coordination set.
[0140] The controller sends a codebook instruction to each base station in the cooperating set, specifying at least one codebook in the sparse code common codebook set of the cooperating set that each base station in the cooperating set can use for data transmission. The codebook command may, but is not limited to, carry codebook information in various forms, such as directly carryi...
Embodiment 3
[0160] In the SCMA communication system, this embodiment provides a data transmission method, such as image 3 As shown, the specific process is as follows:
[0161] 301: The terminal receives a codebook notification sent by a base station in a coordinated set.
[0162] After the base station determines the cooperative codebook used for data transmission with the terminal, it sends a codebook notification. Wherein, the codebook notification is used for the base station to inform the terminal of the cooperative codebook. The codebook notification may, but is not limited to, carry the codebook information in various forms, such as directly carrying the codebook itself, or carrying the codebook index number, codebook sequence number, etc. It should be particularly noted that the cooperative codebooks of each base station in the cooperative set are different from each other.
[0163] After receiving the codebook notification, the terminal can determine the codebook that can be ...
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