Channelization Code Sharing in HSPA Networks
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Solution Overview
Problem
As data rates increase in 3GPP HSPA networks, existing solutions fail to reduce latency and buffer sizes in user equipment (UE) devices effectively, leading to inefficiencies and performance issues.
Innovation Solution
The method involves sharing data channelization codes in a TDMA fashion between mobile stations during downlink transmission, along with proportional sharing of control channelization codes, allowing each station to allocate its share of the code within a transmission time interval, thereby reducing latency and improving radio performance and MIMO efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data rates are increased in HSPA networks, then throughput performance is improved, but latency and buffer sizes increase
Solution Approach 1:
The transmission time interval is segmented into multiple parts, with each mobile station allocated a specific part for data channel transmission. Control channel transmissions are also segmented to match the data channel segmentation, allowing parallel processing and reducing overall latency
Solution Approach 2:
The patent introduces a new dimension of code sharing by sharing both data channelization codes and control channelization codes among mobile stations. This multi-dimensional code allocation approach enables more efficient resource utilization and reduces latency without compromising data rates
2Productivity
If data rates are increased in HSPA networks, then throughput performance is improved, but buffer sizes in UE devices increase
Solution Approach 1:
By segmenting the transmission time interval and allocating specific parts to each mobile station for both data and control channels, the patent reduces the amount of data that needs to be buffered in UE devices, as transmissions are more efficiently organized and delivered in smaller, time-specific portions
Solution Approach 2:
The patent performs preliminary allocation of time slots and channelization codes to mobile stations before data transmission begins. This preliminary organization allows UEs to process and transmit data more efficiently without requiring large buffers to hold undifferentiated data
3Loss of time
If channelization codes are shared in TDMA fashion between mobile stations, then latency is reduced, but system complexity increases
Solution Approach 1:
The patent applies a universal TDMA-based code sharing mechanism that serves multiple functions: it allocates data channel resources, controls control channel resources, and coordinates uplink feedback timing all through the same time-division framework. This multi-functionality reduces the need for separate complex allocation mechanisms
Solution Approach 2:
The patent changes the allocation parameter from traditional dedicated code assignment to dynamic TDMA-based code sharing. By modifying how channelization codes are allocated (from static to dynamic time-sharing), the system reduces latency while managing complexity through a systematic parameter change rather than architectural overhaul
Data Source
AI summary
A method of exchanging data in a communications network is provided. A control channel channelization code is assigned for transmitting user specific data channel allocation information to a particular mobile station (MS). The data channel allocation information indicates which part of the transmission time interval (TTI) available for data can be used by that particular MS. The control channel channelization code is shared in a TDMA fashion between the MSs during the TTI in a proportion equal to that in which the data channel channelization code is shared between the MSs such that each MS is allocated a share of the control channel channelization code in that part of the TTI. The control channel channelization code is then transmitted in a part of the TTI corresponding to that in which the data channel channelization code is transmitted for a particular MS.