Select diversity for radio communications

Abstract

Select diversity in cellular radio communications involving both the radio access network and the mobile radio ensures that an optimal base station cell under a current condition is selected for communicating with the mobile radio. A candidate set of radio base station cells is defined for a radio connection between the radio network and the mobile radio. Packets are sent via the radio network toeach of multiple radio base stations having a cell in the candidate set. The mobile radio detects a current quality of communication for the radio connection, and based on that detected quality, the candidate cell set may change. The mobile radio selects one of the cells in the candidate cell set to send a next or specific data packet based on one or more selection criteria.

Description

technical field [0001] The technical field relates to cellular radio communications, and in particular to Select Diversity in cellular radio communications. Background technique [0002] Handover is an important feature in all modern cellular systems where an established communication link or connection with a mobile radio is transferred from one cell (i.e. geographical coverage area) to another cell to accommodate movement of the mobile radio and / or changing radio conditions. A radio base station is associated with each cell, and a plurality of radio base stations may be controlled by a radio network controller (RNC) or a base station controller (BSC). When new radio access technologies are developed, for example in long-term evolution LTE, like 3GPP, it is necessary to define efficient handover mechanisms for Provides lossless, seamless and fast switching to and from mobile devices. [0003] High-speed downlink packet access (High-Speed ​​Downlink Packet Access HSDPA) i...

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Problems solved by technology

Second, soft handover does not allow independent adaptation of modulation and coding in each cell, since in soft handover communication the coding and modulation schemes must be the same from all transmitters

[0009] Another issue of concern is that the user platform system in the long-term evolution of 3GPP UTRAN is developing towards a simplified network system, where the user platform anchor node (Anchor Node, AN) or access gateway (AGW) of the RNC in UTRAN only performs limited Function

But the result of such a functional change is that Acknowledgment (AM) node packet communication is not supported in anchor nodes

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