Double-connection fountain code transmission method based on partial data overlapping

Abstract

The invention discloses a double-connection fountain code transmission method based on partial data overlapping, and the method comprises the following steps: adding overlapping partial data groups indata groups distributed to two base stations by a core network, and enabling the number of the overlapping partial data groups to account for 10-30% of the total number of all data groups in the basestations; wherein in a base station, the overlapped part data groups have the same selected probability Pover; wherein each non-coincident part data packet has the same selected probability Pnon; obtaining a one-step transfer matrix P when the fountain coding degree is d; calculating in the base station according to the one-step transfer matrix P; wherein the probability Pover is selected for each overlapped part data packet, and the probability Pnon is selected for each non-overlapped part data packet; and then data transmission is carried out according to the probability Pover selected by the data packets of the overlapped parts and the probability Pnon selected by the data packets of the non-overlapped parts, so that the data transmission pressure of the shunt node is reduced, and meanwhile, the fountain code decoding overhead of the receiving end and the redundancy of the system are reduced.

Description

technical field [0001] The invention belongs to the technical field of dual-connection fountain code transmission and communication, and relates to a dual-connection fountain code transmission method based on partial data overlap. Background technique [0002] The 5G NR system is networked on high-frequency bands, and the coverage area is reduced compared with 4G, and high-intensity networking has become a trend. However, due to the high signal frequency of 5G, the propagation loss is greater than that of 4G, and the coverage is also reduced. Although the downlink coverage can reach the same area as 4G by increasing the transmit power of the base station, the uplink from the user to the base station Transmission will still be limited by the transmission power of mobile phones, which will become a shortcoming of 5G. [0003] 3GPP proposed the dual connectivity technology. In the environment of joint networking of macro base stations and small base stations, when the coverage...

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Problems solved by technology

[0006] When considering applying fountain codes to a dual-connection system, there are two problems. First, consider the redundancy of fountain codes. Fountain codes have the characteristic that the more coded packets, the less redundancy. When the two base stations completely separate the original data and are independent of each other, when the receiving end decodes the data received by the two links separately, there will be more redundancy due to fewer encoded packets; second, if in order to reduce redundancy In order to maximize the encoding packet, the receiving end simultaneously receives the fountain packet obtained from the XOR of the same set of encoding packets from the dual connection, that is, the core network transmits the original data intact to the two base stations for fountain encoding. When the core network is limited by the S1 interface (called NG-C interface in 5G) between the core network and the base station, the transmission of data will cause greater pressure on the S1 interface

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