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radio network system

A network system and radio technology, applied in the field of data transmission, can solve the problems of inability to transmit downlink data, short MFH transmission period, etc., and achieve the effect of expanding effective bandwidth and efficient transmission

Active Publication Date: 2020-08-25
NIPPON TELEGRAPH & TELEPHONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, in order to economize MFH by sharing devices or fiber cores, in an arrangement where multiple RRUs are multiplexed by TDM using TDM-PON (Time Division Multiplex-Passive Optical Network) or line concentration switches ( Non-Patent Documents 3 and 4), the MFH transmittable period is used by all multiplexed RRUs in time division, and therefore the MFH transmittable period of each RRU is relatively short, which may result in downlinks that cannot be transmitted from the CU to the RRU road data problem

Method used

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Examples

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no. 1 example

[0046] will refer to figure 1 A radio network system 1 according to a first embodiment of the present invention will be described.

[0047] Such as figure 1 As shown, the radio network system 1 includes: a CU (central unit: radio base station / radio scheduler) 10 connected to MBH (Mobile Backhaul) as a host network; A MFH (Mobile Fronthaul) such as a network) system is connected to a plurality of DMs (Data Managers) 20 of the CU; and a plurality of RRUs (Remote Radio Units) 30 . One or more RRUs are connected to each DM and each RRU performs radio transmission for one or more UEs (User Equipment: Radio Terminal).

[0048] Based on this arrangement, the radio network system 1 has a function of broadcasting downlinks destined for each UE received from the MBH from the CU to the DM via the MFH while allocating the radio resource of the RRU to the radio transmission of the downlink data. data (user data), select the downlink data allocated to the radio resource of the RRU corr...

no. 2 example

[0097] Next will refer to Figure 7 A radio network system 1 according to a second embodiment of the present invention will be described.

[0098] This embodiment will describe an example of a system configuration in which a DM formed of a circuit unit is realized in each ONU (Optical Network Unit) constituting an MFH formed of a TDM-PON system.

[0099] The MFH is formed by a general TDM-PON system, and includes one OLT (Optical Line Terminal) 41 connected to a CU and a plurality of ONUs (Optical Network Units) 42 connected to the OLT via a PON section formed of optical fibers and optical splitters.

[0100] The OLT has a function of broadcasting downlink data output from the CU to each ONU via the PON unit.

[0101] In this embodiment, each ONU accommodates one or more RRUs under itself, and has the function of making the same DM as the DM according to the first embodiment transmit downlink data from the OLT via the PON section Select the downlink data corresponding to the...

no. 3 example

[0138] Next, a radio network system 1 according to a third embodiment of the present invention will be described.

[0139] This embodiment is basically the same as the second embodiment, but differs from the second embodiment in that the CU notifies each ONU of radio channel information via the OLT, and when downlink data is received, each ONU's The DM specifies a UE for which radio transmission is to be performed from each RRU under the DM based on radio channel information, selects only downlink data destined for the UE, and accumulates the selected downlink data in a buffer link data. A case where the present embodiment is applied to the second embodiment will be exemplified. This embodiment can also be applied to the fourth embodiment (described later) in the same manner (described later).

[0140] That is, in this embodiment, the scheduling unit 12 of the CU has a function of generating, for each RRU, a UE candidate indicating that radio transmission is to be performed ...

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Abstract

CU (Central Unit) performs scheduling for allocating radio resource of RRU (Remote Radio Unit) to radio transmission of downlink data while broadcasting downlink data from MBH to DM (Data Manager) via MFH. Each DM selects the downlink data of the RRU (Remote Radio Unit) corresponding to its own DM from the accumulated downlink data from the CU based on the allocation result obtained by scheduling, and transmits the selected downlink data to the corresponding RRU , while discarding the downlink data of other RRUs. Based on the allocation result, each RRU performs radio transmission of downlink data from the DM to the corresponding UE (User Equipment) using designated radio resources. This makes it possible to efficiently transmit downlink data from the CU to each RRU via the MFH constructed by the TDM system represented by TDM-PON.

Description

technical field [0001] The present invention relates to data transmission techniques, and more particularly to data transmission techniques for transmitting downlink data destined for user terminals from a central unit forming a radio network system to a plurality of remote radio units. Background technique [0002] In recent years, in radio network systems, high-density small cell arrangements for accommodating sudden increases in mobile traffic have been carefully studied. Since the cell radius of the small cell is smaller than that of the macro cell, the number of user terminals sharing the same frequency within the cell can be reduced, thereby enhancing the throughput of each user terminal. [0003] On the other hand, a high-density small cell arrangement increases the interference power from neighboring cells. Assume, for example, that multiple cells transmit downlink data to different user terminals simultaneously using the same frequency band. For each user terminal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/44H04W28/14H04W72/04H04W88/08
CPCH04L12/44H04W88/08H04W28/14H04W72/23H04J14/0246H04J14/08H04Q11/0067
Inventor 鹈泽宽之有川勇辉川合健治重松智志
Owner NIPPON TELEGRAPH & TELEPHONE CORP