Dedicated Uplink Resources for Idle Mode Wireless Communication
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Solution Overview
Problem
Current wireless communication standards, such as IEEE 802.16(e), face inefficiencies in random access procedures, location updates, and handling of short data bursts, leading to delays and increased overhead, particularly in idle and sleep modes, and lack support for downlink unicast short data bursts to mobile terminals in idle mode.
Innovation Solution
The method involves allocating dedicated uplink resources for mobile terminals to reduce the need for lengthy random access procedures, allowing efficient location updates and short data burst transmissions without transitioning out of idle or sleep modes, using dedicated pseudorandom noise codes and resource allocation messages to facilitate communication between mobile terminals and base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile terminal uses the random access procedure to initiate transmission to the base station, then the terminal can communicate with the base station, but the transmission power cannot be accurately predicted and the procedure is lengthy
Solution Approach 1:
The base station performs preliminary actions by transmitting location update information and allocating dedicated uplink resources before the mobile terminal needs to communicate. The terminal reads this information during idle mode, so when communication is needed, the terminal can immediately use the pre-allocated dedicated uplink resource without undergoing the full random access procedure, thus reducing transmission time.
Solution Approach 2:
The invention extracts the essential function of random access (resource allocation and power determination) and separates it from the full random access procedure. By having the base station transmit location update information and allocate dedicated resources independently, the terminal can skip the lengthy random access steps while still achieving the core communication objective.
2Measurement precision
If the mobile terminal frequently sends location updates to the base station, then the base station can accurately track the terminal position, but the overhead increases
Solution Approach 1:
The base station transmits location update information and allocated resource indications to the mobile terminal during idle mode as a preliminary action. This allows the terminal to have accurate location tracking without requiring frequent active location update transmissions, thus reducing overhead while maintaining tracking accuracy.
Solution Approach 2:
The mobile terminal uses the pre-transmitted location update information and allocated resource indications to perform location tracking and communication initialization independently. The terminal can initiate communication using the pre-allocated resources without needing to send frequent location updates, making the system more efficient.
3Ease of operation
If the mobile terminal transitions out of idle or sleep modes for location updates and short data bursts, then communication can be established, but battery efficiency decreases
Solution Approach 1:
The base station performs preliminary actions by transmitting location update information and allocating dedicated uplink resources during idle mode. This allows the mobile terminal to remain in idle or sleep mode while still having communication capabilities prepared. When communication is needed, the terminal can use the pre-allocated resources without transitioning to active mode, thus conserving battery energy.
Solution Approach 2:
The dedicated uplink resource allocation mechanism serves multiple functions: it enables location updates, short data bursts, and communication initialization all while the terminal remains in idle mode. This multi-functional approach eliminates the need for mode transitions, improving battery efficiency while maintaining full communication capability.
4Productivity
If the base station uses dedicated uplink resources for the mobile terminal, then the random access procedure is simplified and delays are reduced, but resource allocation complexity increases
Solution Approach 1:
The base station performs resource allocation as a preliminary action during idle mode by transmitting allocated resource indications to the terminal. This allows the terminal to have dedicated uplink resources ready without requiring complex real-time allocation decisions during active communication, thus improving productivity while managing complexity through advance preparation.
Data Source
AI summary
A mobile terminal in a wireless communication network may be one of several modes of operation. When in an idle mode, the mobile terminal may avoid a lengthy random access procedure normally associated with responding to a page from a base station, if the base station includes in the page an indication of a resource that the mobile terminal may utilize when responding to the page. Additionally, the mobile terminal may transmit an efficient location update MAC header to a base station, whether prompted to by a page from the base station or not. Furthermore, without leaving the idle mode or a sleep mode, the mobile terminal may exchange short data burst messages with a base station.