Browse Prior Art Database

Network Coordinated Hybrid Radio Access

IP.com Disclosure Number: IPCOM000170266D
Published in the IP.com Journal: Volume 8 Issue 5B (2008-06-03)
Included in the Prior Art Database: 2008-Jun-03
Document File: 7 page(s) / 301K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

Broadband Wireless Multimedia (BWM) is a standardization for telephone networks (see Figure 1). For BWM, commonly used system architectures and frame structures have been defined. Implementing present developments, it is likely that mobile stations (MS) using OFDMA (Orthogonal Frequency-Division Multiple Access) uplink and MSs using GMC (Generalized Multiple Carriers) uplink will co-exist within BWM (see Figures 2 and 3). This co-existence is problematic for some applications and implicates essential adjustments at the BWM architecture. Therefore, adjustments of MAC (Media Access Control) messages are proposed to indicate whether the Base Station (BS) has capabilities to handle GMC and to differentiate between GMC uplink and OFDMA uplink. Further, a new network acquisition and entry procedure for MSs with GMC are proposed.

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Network Coordinated Hybrid Radio Access

Idea: Ling Wang, CN-Beijing; Shaohua Li, CN-Beijing; Jijun Luo DE-Munich; Yong Teng, CN-Beijing

Broadband Wireless Multimedia (BWM) is a standardization for telephone networks (see Figure 1). For BWM, commonly used system architectures and frame structures have been defined. Implementing present developments, it is likely that mobile stations (MS) using OFDMA (Orthogonal Frequency- Division Multiple Access) uplink and MSs using GMC (Generalized Multiple Carriers) uplink will co- exist within BWM (see Figures 2 and 3).

This co-existence is problematic for some applications and implicates essential adjustments at the BWM architecture. Therefore, adjustments of MAC (Media Access Control) messages are proposed to indicate whether the Base Station (BS) has capabilities to handle GMC and to differentiate between GMC uplink and OFDMA uplink. Further, a new network acquisition and entry procedure for MSs with GMC are proposed.

Therefore, the OFDMA TDD (Time Division Duplex) frame in IEEE 802.16e (Institute of Electrical and Electronics Engineers) is considered as an access data transmission sub-frame for BWM systems (shown in Figure 4). The downlink transmission for BSs is proposed to use OFDMA architecture. Uplink transmission can support GMC (including the GMC variant DFT-S-GMC: Discrete Fourier Transform-Spread-GMC) or OFDMA by interpreting an embedded information element (IE) or FCH (Frame Control Header). It is indicated whether the current BS supports GMC and OFDMA uplink transmission at the same time. During session establishment, the MS has to exchange information to indicate whether it is a GMC terminal or an OFDMA terminal.

In order to support multiple modes, one bit is proposed to indicate whether the BS supports MSs with GMC uplink. This bit, called Hybrid Uplink Multiple Access Indicator (HUMAI) is defined in the MAC message (e.g. DCD: Downlink Channel Descriptor or UCD: Uplink Channel Descriptor) as shown in Figure 5. These messages are broadcasted periodically and HUMAI can be set:
HUMAI = 1: Support of hybrid uplink with GMC or OFDMA.

HUMAI = 0: Only support of OFDMA uplink.

This can also be defined in the DL_Frame_Prefix (Download Frame Prefix), as shown in Figure 6. The DL_Frame_Prefix is a data structure transmitted at the beginning of each frame which contains information regarding the current frame and mapping to the FCH. With this proposed setup, MSs with GMC support and OFDMA support can be used simultaneously.

The proposed new procedure definition for multiple mode support of BSs is shown in the following three steps:
1) New Network Acquisition procedure
Synchronization is the first step of the network acquisition process. When the MS wants to join the network, it scans for a BWM signal in the predefined frequency. It detects the preamble sequence present in...