Communication Apparatus Partial Band Control Signal Area
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Solution Overview
Problem
In dense wireless LAN environments, wireless terminals often fail to receive preamble signals due to overlapping networks, leading to incomplete information for transmission parameter adjustments, resulting in increased interference and reduced opportunities for transmission.
Innovation Solution
A communication apparatus and method that include a partial band processing unit to provide a control signal area within the occupied band of a packet, containing information like NAV, network identifier, transmission power, and interference allowance, allowing terminals to set NAV and perform spatial reuse transmission even if the preamble signal is missed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless terminals rely on receiving preamble signals for transmission parameter adjustments, then transmission coordination can be achieved, but in dense wireless LAN environments, terminals often fail to receive preamble signals due to overlapping networks, resulting in incomplete information and increased interference
Solution Approach 1:
The patent segments the control information into two parts: traditional preamble signals and a new control signal area embedded within the packet body. This segmentation allows receivers to obtain control information from multiple sources, so if the preamble is missed due to interference, the control signal area in the packet body still provides necessary transmission parameters and NAV information.
Solution Approach 2:
The patent embeds control information including NAV (Network Allocation Vector) and transmission parameters in advance within the packet body's control signal area. This preliminary inclusion ensures that even if terminals miss the preamble signal, they can still acquire the necessary information for transmission coordination from the control signal area before attempting to transmit.
2Reliability
If transmission suppression mechanisms like NAV and EIFS are used to avoid interference, then network coordination is improved, but transmission opportunities are excessively reduced
Solution Approach 1:
The patent enables different terminals to have different reception qualities by embedding control information in both preamble and packet body. Terminals with good reception can use only the preamble, while terminals with poor reception (affected by interference) can still extract control information from the control signal area in the packet body, allowing them to participate in transmission opportunities they would otherwise miss.
Solution Approach 2:
The patent changes the parameter distribution of control information by duplicating key parameters (NAV, transmission power, duration) from the preamble into the control signal area within the packet body. This parameter redundancy ensures that terminals can acquire necessary information under varying channel conditions, thereby increasing transmission opportunities without compromising network coordination.
3Device complexity
If control information is only provided in the preamble signal, then packet structure remains simple, but terminals cannot obtain complete information when preamble reception fails
Solution Approach 1:
The patent nests the control signal area within the packet body structure. The control signal area is embedded as a specific field within the existing packet framework, containing control information that mirrors or supplements the preamble content. This nested structure adds redundancy without fundamentally altering the overall packet architecture, maintaining relative simplicity while preventing information loss.
4Object-affected harmful factors
If terminals suppress transmission to avoid interference, then network interference is reduced, but transmission opportunities and resource utilization decrease
Solution Approach 1:
The patent implements a feedback mechanism where the control signal area in the packet body provides transmission parameters and NAV information that enable terminals to make informed transmission decisions. Terminals can use this information to determine appropriate transmission power levels and timing, allowing them to transmit without causing excessive interference while still utilizing available resources efficiently.
Data Source
AI summary
Provided are a communication apparatus and a communication method for transmitting and receiving wireless packets.A communication apparatus includes: a communication unit configured to transmit and receive a packet in a predetermined occupied band; and a partial band processing unit configured to provide a control signal area including predetermined control information in a part of the occupied band of the packet transmitted from the communication unit. The control information includes a plurality of synchronization signals at defined time intervals, and includes information for a third station that is not a destination of the packet, such as information regarding a NAV, a network identifier for identifying a network to which the communication apparatus belongs, transmission power information of the packet, allowable interference amount information, and remaining time information of the packet.