ndalone bandwidth request header is transmitted using the UL grant allocated to the MS, it may be used to request bandwidth for one or multiple flows, GPI change for aGPS, or minimum delay of the requested grant for BE QoS class, and includes the following parameters. The BS uses the size of single flow standalone bandwidth request header for polling allocation. FID of the requesting connection; Aggregate or incremental bandwidth to request one or multiple flows; New GPI value for aGPS or minimum delay of the requested grant for BE QoS class; GPI change indicator for aGPS. A piggybacked bandwidth request includes the FID of the requesting connection and the aggregated bandwidth. Multiple requests can be included in one piggyback bandwidth request. In the bandwidth request procedure, the grant for BW-REQ message is allocated by CDMA Allocation A-MAP IE. The CDMA Allocation A-MAP IE is used for allocation of bandwidth to a user that requested bandwidth using a ranging or BR code. The MS decodes the information element and verifies the "CRC masked by the reserved STID for BR-ACK A-MAP" (MCRC) field with its specific 12-bit Random Access Identifier (RAID) and 4-bit Masking Indicator. The RA-ID is calculated by a hash function with the mobile station's random access attributes (Frame Number Index [4 bits], Ranging Code/BR Code Index [6 bits], and Opportunity Index [2 bits]). The Masking Indicator indicates the identifier used for CRC masking. The allocation is in the first UL subframe relevant to the A-MAP region, regardless of DL/UL ratio. The BS requests adjustment of timing and power by MS using Timing Adjust (amount of timing advance required to adjust the MS uplink transmission), Power Level Adjust (relative change in uplink transmission power level), and Offset Frequency Adjust (relative change in uplink transmission frequency) in CDMA Allocation A-MAP IE for ranging [2]. 6.12 MULTI-RADIO COEXISTENCE The IEEE 802.1 can support and facilitate collocated multi-radio operation and coexistence on a mobile platform t