Radio Base Station Session Management for Packet Delivery
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Solution Overview
Problem
Radio base stations in LTE systems face inefficiencies in resource use and coverage due to high ratios of RTP, UDP, and IP headers to payloads, leading to incorrect identification of new sessions, resulting in unnecessary rejection of new sessions and packet discard.
Innovation Solution
A radio base station with a communication control unit that detects changes in static parts of packets, allowing the addition of new sessions even if it exceeds capacity, by deleting existing sessions or performing handovers, to prevent packet discard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio base station eNB strictly enforces the maximum number of sessions limit in a bearer, then session management capability is maintained within device limits, but packets from sessions with changed static parts are incorrectly discarded
Solution Approach 1:
The patent segments session identification into two parts: static part (e.g., SSRC, IP address) and dynamic part (e.g., RTP timestamp, sequence number). By only monitoring static parts for session identification and allowing dynamic parts to change, the system correctly identifies when a session truly changes versus when it's the same session with updated parameters, preventing false session additions and packet discards.
Solution Approach 2:
The patent implements a feedback mechanism where the eNB continuously monitors packet headers for static part changes and uses this information to dynamically adjust session management decisions. When static parts change, the system provides feedback to determine whether to add a new session or update an existing one, ensuring accurate session tracking while maintaining the maximum session limit.
2Reliability
If the radio base station eNB adds a new session when static part changes are detected, then packet delivery is maintained, but the number of sessions may exceed device capability limits
Solution Approach 1:
By segmenting session identification into static and dynamic parts, the patent enables the system to distinguish between genuine new sessions (requiring addition) and existing sessions with updated parameters (requiring no new session). This segmentation allows reliable packet delivery through appropriate session management while preventing excessive session creation that would exceed device capabilities.
Solution Approach 2:
The patent applies dynamics by making session management flexible and adaptive rather than rigid. The system dynamically determines whether to add or update sessions based on real-time analysis of packet headers, adjusting session management strategies according to actual network conditions and device capacity, thus maintaining reliability without exceeding adaptability limits.
3Productivity
If header compression is applied to voice packets, then resource use efficiency is improved, but incorrect identification of session changes occurs leading to packet discard
Solution Approach 1:
The patent segments header fields into static parts (suitable for compression and reliable for session identification) and dynamic parts (subject to change but not used for session identification). This segmentation enables effective header compression while maintaining reliable session change detection, as the static parts provide stable identification markers that work well with compression techniques like ROHC.
Solution Approach 2:
The static part of the header acts as an intermediary between header compression and session management. It provides a stable reference point that survives compression and decompression processes, enabling the eNB to reliably identify session changes even when other header fields are compressed or modified, thus maintaining both productivity gains from compression and reliability of packet delivery.
Data Source
AI summary
When a packet in which a “Static part” is changed is detected in a session established in a bearer, it is possible to prevent the packet from being discarded. A radio base station (eNB) according to the present invention includes a communication control unit (13) configured to control communication via a session (an RTP session or an RTCP session) with a mobile station (UE). The communication control unit (13) is configured such that, when a change in a “Static part” in a header of a received packet is detected, even if adding a new session to transmit the packet makes the number of sessions established in a bearer (#1) exceed a capability of the radio base station (eNB) or the mobile station (UE), the communication control unit (13) transmits the packet via the new session.